use less exception throwing for flow control

Change-Id: Ib376a1bcb75e72d6e5754818a353b0d9c7dbd26d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/171851
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

14 files changed, 140 insertions, 90 deletions

diff --git a/sfx2/source/dialog/dinfdlg.cxx b/sfx2/source/dialog/dinfdlg.cxx
index 537206b3f98c..d752920ac490 100644
--- a/sfx2/source/dialog/dinfdlg.cxx
+++ b/sfx2/source/dialog/dinfdlg.cxx
@@ -1294,10 +1294,13 @@ void SfxDocumentPage::Reset( const SfxItemSet* rSet )
     {
         try
         {
-            uno::Reference< lang::XMultiServiceFactory > xFac( pDocSh->GetModel(), uno::UNO_QUERY_THROW );
-            uno::Reference< beans::XPropertySet > xProps( xFac->createInstance(u"com.sun.star.document.Settings"_ustr), uno::UNO_QUERY_THROW );
-
-            xProps->getPropertyValue(u"ImagePreferredDPI"_ustr) >>= nImagePreferredDPI;
+            uno::Reference< lang::XMultiServiceFactory > xFac( pDocSh->GetModel(), uno::UNO_QUERY );
+            if (xFac)
+            {
+                uno::Reference< beans::XPropertySet > xProps( xFac->createInstance(u"com.sun.star.document.Settings"_ustr), uno::UNO_QUERY );
+                if (xProps)
+                    xProps->getPropertyValue(u"ImagePreferredDPI"_ustr) >>= nImagePreferredDPI;
+            }
         }
         catch( uno::Exception& )
         {
diff --git a/sfx2/source/dialog/documentfontsdialog.cxx b/sfx2/source/dialog/documentfontsdialog.cxx
index 281baf5278ed..73918ca059d8 100644
--- a/sfx2/source/dialog/documentfontsdialog.cxx
+++ b/sfx2/source/dialog/documentfontsdialog.cxx
@@ -60,14 +60,19 @@ void SfxDocumentFontsPage::Reset( const SfxItemSet* )
     {
         try
         {
-            uno::Reference< lang::XMultiServiceFactory > xFac( pDocSh->GetModel(), uno::UNO_QUERY_THROW );
-            uno::Reference< beans::XPropertySet > xProps( xFac->createInstance(u"com.sun.star.document.Settings"_ustr), uno::UNO_QUERY_THROW );
-
-            xProps->getPropertyValue(u"EmbedFonts"_ustr) >>= bEmbedFonts;
-            xProps->getPropertyValue(u"EmbedOnlyUsedFonts"_ustr) >>= bEmbedUsedFonts;
-            xProps->getPropertyValue(u"EmbedLatinScriptFonts"_ustr) >>= bEmbedLatinScriptFonts;
-            xProps->getPropertyValue(u"EmbedAsianScriptFonts"_ustr) >>= bEmbedAsianScriptFonts;
-            xProps->getPropertyValue(u"EmbedComplexScriptFonts"_ustr) >>= bEmbedComplexScriptFonts;
+            uno::Reference< lang::XMultiServiceFactory > xFac( pDocSh->GetModel(), uno::UNO_QUERY );
+            if (xFac)
+            {
+                uno::Reference< beans::XPropertySet > xProps( xFac->createInstance(u"com.sun.star.document.Settings"_ustr), uno::UNO_QUERY);
+                if (xProps)
+                {
+                    xProps->getPropertyValue(u"EmbedFonts"_ustr) >>= bEmbedFonts;
+                    xProps->getPropertyValue(u"EmbedOnlyUsedFonts"_ustr) >>= bEmbedUsedFonts;
+                    xProps->getPropertyValue(u"EmbedLatinScriptFonts"_ustr) >>= bEmbedLatinScriptFonts;
+                    xProps->getPropertyValue(u"EmbedAsianScriptFonts"_ustr) >>= bEmbedAsianScriptFonts;
+                    xProps->getPropertyValue(u"EmbedComplexScriptFonts"_ustr) >>= bEmbedComplexScriptFonts;
+                }
+            }
         }
         catch( uno::Exception& )
         {
@@ -95,13 +100,19 @@ bool SfxDocumentFontsPage::FillItemSet( SfxItemSet* )
     {
         try
         {
-            uno::Reference< lang::XMultiServiceFactory > xFac( pDocSh->GetModel(), uno::UNO_QUERY_THROW );
-            uno::Reference< beans::XPropertySet > xProps( xFac->createInstance(u"com.sun.star.document.Settings"_ustr), uno::UNO_QUERY_THROW );
-            xProps->setPropertyValue(u"EmbedFonts"_ustr, uno::Any(bEmbedFonts));
-            xProps->setPropertyValue(u"EmbedOnlyUsedFonts"_ustr, uno::Any(bEmbedUsedFonts));
-            xProps->setPropertyValue(u"EmbedLatinScriptFonts"_ustr, uno::Any(bEmbedLatinScriptFonts));
-            xProps->setPropertyValue(u"EmbedAsianScriptFonts"_ustr, uno::Any(bEmbedAsianScriptFonts));
-            xProps->setPropertyValue(u"EmbedComplexScriptFonts"_ustr, uno::Any(bEmbedComplexScriptFonts));
+            uno::Reference< lang::XMultiServiceFactory > xFac( pDocSh->GetModel(), uno::UNO_QUERY );
+            if (xFac)
+            {
+                uno::Reference< beans::XPropertySet > xProps( xFac->createInstance(u"com.sun.star.document.Settings"_ustr), uno::UNO_QUERY );
+                if (xProps)
+                {
+                    xProps->setPropertyValue(u"EmbedFonts"_ustr, uno::Any(bEmbedFonts));
+                    xProps->setPropertyValue(u"EmbedOnlyUsedFonts"_ustr, uno::Any(bEmbedUsedFonts));
+                    xProps->setPropertyValue(u"EmbedLatinScriptFonts"_ustr, uno::Any(bEmbedLatinScriptFonts));
+                    xProps->setPropertyValue(u"EmbedAsianScriptFonts"_ustr, uno::Any(bEmbedAsianScriptFonts));
+                    xProps->setPropertyValue(u"EmbedComplexScriptFonts"_ustr, uno::Any(bEmbedComplexScriptFonts));
+                }
+            }
         }
         catch( uno::Exception& )
         {
diff --git a/sfx2/source/doc/DocumentSigner.cxx b/sfx2/source/doc/DocumentSigner.cxx
index 88dd7c3c3570..ae2db667ca75 100644
--- a/sfx2/source/doc/DocumentSigner.cxx
+++ b/sfx2/source/doc/DocumentSigner.cxx
@@ -98,9 +98,12 @@ bool DocumentSigner::signDocument(uno::Reference<security::XCertificate> const&
             if (bSuccess)
             {
                 uno::Reference<embed::XTransactedObject> xTransact(xWriteableZipStore,
-                                                                   uno::UNO_QUERY_THROW);
-                xTransact->commit();
-                bResult = true;
+                                                                   uno::UNO_QUERY);
+                if (xTransact)
+                {
+                    xTransact->commit();
+                    bResult = true;
+                }
             }
         }
         else
diff --git a/sfx2/source/doc/docfile.cxx b/sfx2/source/doc/docfile.cxx
index 1674a41131df..c9631f64cbde 100644
--- a/sfx2/source/doc/docfile.cxx
+++ b/sfx2/source/doc/docfile.cxx
@@ -4676,12 +4676,15 @@ bool SfxMedium::SwitchDocumentToFile( const OUString& aURL )
         {
             try
             {
-                uno::Reference< io::XTruncate > xTruncate( pImpl->xStream, uno::UNO_QUERY_THROW );
-                xTruncate->truncate();
-                if ( xOptStorage.is() )
-                    xOptStorage->writeAndAttachToStream( pImpl->xStream );
-                pImpl->xStorage = xStorage;
-                bResult = true;
+                uno::Reference< io::XTruncate > xTruncate( pImpl->xStream, uno::UNO_QUERY );
+                if (xTruncate)
+                {
+                    xTruncate->truncate();
+                    if ( xOptStorage.is() )
+                        xOptStorage->writeAndAttachToStream( pImpl->xStream );
+                    pImpl->xStorage = xStorage;
+                    bResult = true;
+                }
             }
             catch( const uno::Exception& )
             {}
diff --git a/sfx2/source/doc/doctemplates.cxx b/sfx2/source/doc/doctemplates.cxx
index 82826eb4c711..b5926871954e 100644
--- a/sfx2/source/doc/doctemplates.cxx
+++ b/sfx2/source/doc/doctemplates.cxx
@@ -674,11 +674,14 @@ void SfxDocTplService::getTitleFromURL( const OUString& rURL, OUString& aTitle,
         if ( !aDocType.isEmpty() )
             try
             {
-                uno::Reference< container::XNameAccess > xTypeDetection( mxType, uno::UNO_QUERY_THROW );
-                SequenceAsHashMap aTypeProps( xTypeDetection->getByName( aDocType ) );
-                aType = aTypeProps.getUnpackedValueOrDefault(
-                            u"MediaType"_ustr,
-                            OUString() );
+                uno::Reference< container::XNameAccess > xTypeDetection( mxType, uno::UNO_QUERY );
+                if (xTypeDetection)
+                {
+                    SequenceAsHashMap aTypeProps( xTypeDetection->getByName( aDocType ) );
+                    aType = aTypeProps.getUnpackedValueOrDefault(
+                                u"MediaType"_ustr,
+                                OUString() );
+                }
             }
             catch( uno::Exception& )
             {}
diff --git a/sfx2/source/doc/guisaveas.cxx b/sfx2/source/doc/guisaveas.cxx
index bcbd7679bef5..8688abd73117 100644
--- a/sfx2/source/doc/guisaveas.cxx
+++ b/sfx2/source/doc/guisaveas.cxx
@@ -225,20 +225,20 @@ public:
     {
         try
         {
-            uno::Reference< lang::XMultiServiceFactory > xDocSettingsSupplier( xModel, uno::UNO_QUERY_THROW );
-            m_xDocumentSettings.set(
-                xDocSettingsSupplier->createInstance( u"com.sun.star.document.Settings"_ustr ),
-                uno::UNO_QUERY_THROW );
-
-            try
+            uno::Reference< lang::XMultiServiceFactory > xDocSettingsSupplier( xModel, uno::UNO_QUERY );
+            if (xModel)
             {
-                OUString aLoadReadonlyString( u"LoadReadonly"_ustr );
-                m_xDocumentSettings->getPropertyValue( aLoadReadonlyString ) >>= m_bPreserveReadOnly;
-                m_xDocumentSettings->setPropertyValue( aLoadReadonlyString, uno::Any( bReadOnly ) );
-                m_bReadOnlySupported = true;
+                m_xDocumentSettings.set(
+                    xDocSettingsSupplier->createInstance( u"com.sun.star.document.Settings"_ustr ),
+                    uno::UNO_QUERY );
+                if (m_xDocumentSettings)
+                {
+                    OUString aLoadReadonlyString( u"LoadReadonly"_ustr );
+                    m_xDocumentSettings->getPropertyValue( aLoadReadonlyString ) >>= m_bPreserveReadOnly;
+                    m_xDocumentSettings->setPropertyValue( aLoadReadonlyString, uno::Any( bReadOnly ) );
+                    m_bReadOnlySupported = true;
+                }
             }
-            catch( const uno::Exception& )
-            {}
         }
         catch( const uno::Exception& )
         {}
diff --git a/sfx2/source/doc/objserv.cxx b/sfx2/source/doc/objserv.cxx
index 26301eb1cb6d..ab43f0482492 100644
--- a/sfx2/source/doc/objserv.cxx
+++ b/sfx2/source/doc/objserv.cxx
@@ -1839,8 +1839,9 @@ uno::Sequence< security::DocumentSignatureInformation > SfxObjectShell::GetDocum
                 OUString aVersion;
                 try
                 {
-                    uno::Reference < beans::XPropertySet > xPropSet( GetStorage(), uno::UNO_QUERY_THROW );
-                    xPropSet->getPropertyValue(u"Version"_ustr) >>= aVersion;
+                    uno::Reference < beans::XPropertySet > xPropSet( GetStorage(), uno::UNO_QUERY );
+                    if (xPropSet)
+                        xPropSet->getPropertyValue(u"Version"_ustr) >>= aVersion;
                 }
                 catch( uno::Exception& )
                 {
diff --git a/sfx2/source/doc/objstor.cxx b/sfx2/source/doc/objstor.cxx
index fefea8c2969a..fe00764a6bee 100644
--- a/sfx2/source/doc/objstor.cxx
+++ b/sfx2/source/doc/objstor.cxx
@@ -1532,8 +1532,9 @@ bool SfxObjectShell::SaveTo_Impl
             OUString aODFVersion;
             try
             {
-                uno::Reference < beans::XPropertySet > xPropSet( GetStorage(), uno::UNO_QUERY_THROW );
-                xPropSet->getPropertyValue(u"Version"_ustr) >>= aODFVersion;
+                uno::Reference < beans::XPropertySet > xPropSet( GetStorage(), uno::UNO_QUERY );
+                if (xPropSet)
+                    xPropSet->getPropertyValue(u"Version"_ustr) >>= aODFVersion;
             }
             catch( uno::Exception& )
             {}
@@ -1769,9 +1770,10 @@ bool SfxObjectShell::SaveTo_Impl
 
                 try
                 {
-                    uno::Reference< beans::XPropertySet > xProps( rMedium.GetStorage(), uno::UNO_QUERY_THROW );
-                    xProps->setPropertyValue(u"MediaType"_ustr,
-                                            uno::Any( aDataFlavor.MimeType ) );
+                    uno::Reference< beans::XPropertySet > xProps( rMedium.GetStorage(), uno::UNO_QUERY );
+                    if (xProps)
+                        xProps->setPropertyValue(u"MediaType"_ustr,
+                                                uno::Any( aDataFlavor.MimeType ) );
                 }
                 catch( uno::Exception& )
                 {
@@ -1975,8 +1977,9 @@ bool SfxObjectShell::SaveTo_Impl
                 OUString aVersion;
                 try
                 {
-                    uno::Reference < beans::XPropertySet > xPropSet( rMedium.GetStorage(), uno::UNO_QUERY_THROW );
-                    xPropSet->getPropertyValue(u"Version"_ustr) >>= aVersion;
+                    uno::Reference < beans::XPropertySet > xPropSet( rMedium.GetStorage(), uno::UNO_QUERY );
+                    if (xPropSet)
+                        xPropSet->getPropertyValue(u"Version"_ustr) >>= aVersion;
                 }
                 catch( uno::Exception& )
                 {
@@ -2289,15 +2292,17 @@ bool SfxObjectShell::ConnectTmpStorage_Impl(
                 // Get rid of this workaround after issue i113914 is fixed
                 try
                 {
-                    uno::Reference< script::XStorageBasedLibraryContainer > xBasicLibraries( pImpl->xBasicLibraries, uno::UNO_QUERY_THROW );
-                    xBasicLibraries->setRootStorage( xTmpStorage );
+                    uno::Reference< script::XStorageBasedLibraryContainer > xBasicLibraries( pImpl->xBasicLibraries, uno::UNO_QUERY );
+                    if (xBasicLibraries)
+                        xBasicLibraries->setRootStorage( xTmpStorage );
                 }
                 catch( uno::Exception& )
                 {}
                 try
                 {
-                    uno::Reference< script::XStorageBasedLibraryContainer > xDialogLibraries( pImpl->xDialogLibraries, uno::UNO_QUERY_THROW );
-                    xDialogLibraries->setRootStorage( xTmpStorage );
+                    uno::Reference< script::XStorageBasedLibraryContainer > xDialogLibraries( pImpl->xDialogLibraries, uno::UNO_QUERY );
+                    if (xDialogLibraries)
+                        xDialogLibraries->setRootStorage( xTmpStorage );
                 }
                 catch( uno::Exception& )
                 {}
@@ -2453,15 +2458,17 @@ bool SfxObjectShell::DoSaveCompleted( SfxMedium* pNewMed, bool bRegisterRecent )
         // Get rid of this workaround after issue i113914 is fixed
         try
         {
-            uno::Reference< script::XStorageBasedLibraryContainer > xBasicLibraries( pImpl->xBasicLibraries, uno::UNO_QUERY_THROW );
-            xBasicLibraries->setRootStorage( xStorage );
+            uno::Reference< script::XStorageBasedLibraryContainer > xBasicLibraries( pImpl->xBasicLibraries, uno::UNO_QUERY );
+            if (xBasicLibraries)
+                xBasicLibraries->setRootStorage( xStorage );
         }
         catch( uno::Exception& )
         {}
         try
         {
-            uno::Reference< script::XStorageBasedLibraryContainer > xDialogLibraries( pImpl->xDialogLibraries, uno::UNO_QUERY_THROW );
-            xDialogLibraries->setRootStorage( xStorage );
+            uno::Reference< script::XStorageBasedLibraryContainer > xDialogLibraries( pImpl->xDialogLibraries, uno::UNO_QUERY );
+            if (xDialogLibraries)
+                xDialogLibraries->setRootStorage( xStorage );
         }
         catch( uno::Exception& )
         {}
@@ -4137,9 +4144,12 @@ bool SfxObjectShell::GenerateAndStoreThumbnail(bool bEncrypted, const uno::Refer
 
             if (xStream.is() && WriteThumbnail(bEncrypted, xStream))
             {
-                uno::Reference<embed::XTransactedObject> xTransactedObject(xThumbnailStorage, uno::UNO_QUERY_THROW);
-                xTransactedObject->commit();
-                bResult = true;
+                uno::Reference<embed::XTransactedObject> xTransactedObject(xThumbnailStorage, uno::UNO_QUERY);
+                if (xTransactedObject)
+                {
+                    xTransactedObject->commit();
+                    bResult = true;
+                }
             }
         }
     }
diff --git a/sot/source/unoolestorage/xolesimplestorage.cxx b/sot/source/unoolestorage/xolesimplestorage.cxx
index 9336b67bb32f..a3ce980fdbe4 100644
--- a/sot/source/unoolestorage/xolesimplestorage.cxx
+++ b/sot/source/unoolestorage/xolesimplestorage.cxx
@@ -97,8 +97,9 @@ OLESimpleStorage::OLESimpleStorage(
         {
             try
             {
-                uno::Reference< io::XSeekable > xSeek( xInputStream, uno::UNO_QUERY_THROW );
-                xSeek->seek( 0 );
+                uno::Reference< io::XSeekable > xSeek( xInputStream, uno::UNO_QUERY );
+                if (xSeek)
+                    xSeek->seek( 0 );
             }
             catch( uno::Exception& )
             {}
diff --git a/svx/source/smarttags/SmartTagMgr.cxx b/svx/source/smarttags/SmartTagMgr.cxx
index 084311205109..86322fcc1234 100644
--- a/svx/source/smarttags/SmartTagMgr.cxx
+++ b/svx/source/smarttags/SmartTagMgr.cxx
@@ -242,7 +242,9 @@ void SmartTagMgr::WriteConfiguration( const bool* pIsLabelTextWithSmartTags,
     {
         try
         {
-            Reference< util::XChangesBatch >( mxConfigurationSettings, UNO_QUERY_THROW )->commitChanges();
+            Reference< util::XChangesBatch > xChanges( mxConfigurationSettings, UNO_QUERY );
+            if (xChanges)
+                xChanges->commitChanges();
         }
         catch ( css::uno::Exception& )
         {
@@ -446,10 +448,11 @@ void SmartTagMgr::RegisterListener()
     {
         Reference<deployment::XExtensionManager> xExtensionManager(
                 deployment::ExtensionManager::get( mxContext ) );
-        Reference< util::XModifyBroadcaster > xMB ( xExtensionManager, UNO_QUERY_THROW );
-
-        Reference< util::XModifyListener > xListener( this );
-        xMB->addModifyListener( xListener );
+        if (xExtensionManager)
+        {
+            Reference< util::XModifyListener > xListener( this );
+            xExtensionManager->addModifyListener( xListener );
+        }
     }
     catch ( uno::Exception& )
     {
@@ -458,9 +461,12 @@ void SmartTagMgr::RegisterListener()
     // register as listener at configuration
     try
     {
-        Reference<util::XChangesNotifier> xCN( mxConfigurationSettings, UNO_QUERY_THROW );
-        Reference< util::XChangesListener > xListener( this );
-        xCN->addChangesListener( xListener );
+        Reference<util::XChangesNotifier> xCN( mxConfigurationSettings, UNO_QUERY );
+        if (xCN)
+        {
+            Reference< util::XChangesListener > xListener( this );
+            xCN->addChangesListener( xListener );
+        }
     }
     catch ( uno::Exception& )
     {
diff --git a/svx/source/tbxctrls/StylesPreviewToolBoxControl.cxx b/svx/source/tbxctrls/StylesPreviewToolBoxControl.cxx
index 5496f4d4ae9a..a15d81f01be8 100644
--- a/svx/source/tbxctrls/StylesPreviewToolBoxControl.cxx
+++ b/svx/source/tbxctrls/StylesPreviewToolBoxControl.cxx
@@ -101,13 +101,16 @@ void StylesPreviewToolBoxControl::InitializeStyles(
                     if (xCellStyles->hasByName(sStyleName))
                     {
                         css::uno::Reference<css::beans::XPropertySet> xStyle(
-                            xCellStyles->getByName(sStyleName), css::uno::UNO_QUERY_THROW);
-                        OUString sName;
-                        xStyle->getPropertyValue(u"DisplayName"_ustr) >>= sName;
-                        if (!sName.isEmpty())
+                            xCellStyles->getByName(sStyleName), css::uno::UNO_QUERY);
+                        if (xStyle)
                         {
-                            m_aDefaultStyles.push_back(
-                                std::pair<OUString, OUString>(sStyleName, sName));
+                            OUString sName;
+                            xStyle->getPropertyValue(u"DisplayName"_ustr) >>= sName;
+                            if (!sName.isEmpty())
+                            {
+                                m_aDefaultStyles.push_back(
+                                    std::pair<OUString, OUString>(sStyleName, sName));
+                            }
                         }
                     }
                 }
diff --git a/svx/source/tbxctrls/tbcontrl.cxx b/svx/source/tbxctrls/tbcontrl.cxx
index 95631463bd21..31e0fdc3f109 100644
--- a/svx/source/tbxctrls/tbcontrl.cxx
+++ b/svx/source/tbxctrls/tbcontrl.cxx
@@ -2832,8 +2832,9 @@ SvxLineWindow_Impl::SvxLineWindow_Impl(SvxFrameToolBoxControl* pControl, weld::W
 {
     try
     {
-        Reference< lang::XServiceInfo > xServices(m_xFrame->getController()->getModel(), UNO_QUERY_THROW);
-        m_bIsWriter = xServices->supportsService(u"com.sun.star.text.TextDocument"_ustr);
+        Reference< lang::XServiceInfo > xServices(m_xFrame->getController()->getModel(), UNO_QUERY);
+        if (xServices)
+            m_bIsWriter = xServices->supportsService(u"com.sun.star.text.TextDocument"_ustr);
     }
     catch(const uno::Exception& )
     {
diff --git a/svx/source/xml/xmleohlp.cxx b/svx/source/xml/xmleohlp.cxx
index beb39da14ff8..d931e2a15105 100644
--- a/svx/source/xml/xmleohlp.cxx
+++ b/svx/source/xml/xmleohlp.cxx
@@ -373,12 +373,16 @@ void SvXMLEmbeddedObjectHelper::ImplReadObject(
 
                 // TODO/LATER: what to do when other types of objects are based on substream persistence?
                 // This is an ole object
-                uno::Reference< beans::XPropertySet > xProps( xStm, uno::UNO_QUERY_THROW );
-                xProps->setPropertyValue(
-                    u"MediaType"_ustr,
-                    uno::Any( u"application/vnd.sun.star.oleobject"_ustr ) );
+                uno::Reference< beans::XPropertySet > xProps( xStm, uno::UNO_QUERY );
+                if (xProps)
+                {
+                    xProps->setPropertyValue(
+                        u"MediaType"_ustr,
+                        uno::Any( u"application/vnd.sun.star.oleobject"_ustr ) );
+
 
-                xStm->getOutputStream()->closeOutput();
+                    xStm->getOutputStream()->closeOutput();
+                }
             }
             catch ( uno::Exception& )
             {
diff --git a/svx/source/xml/xmlxtimp.cxx b/svx/source/xml/xmlxtimp.cxx
index a6d2b80194b4..a2ce48ddc713 100644
--- a/svx/source/xml/xmlxtimp.cxx
+++ b/svx/source/xml/xmlxtimp.cxx
@@ -476,8 +476,9 @@ bool SvxXMLXTableImport::load( const OUString &rPath, const OUString &rReferer,
 
         try
         {
-            uno::Reference< io::XSeekable > xSeek( aParserInput.aInputStream, uno::UNO_QUERY_THROW );
-            xSeek->seek( 0 );
+            uno::Reference< io::XSeekable > xSeek( aParserInput.aInputStream, uno::UNO_QUERY );
+            if (xSeek)
+                xSeek->seek( 0 );
         }
         catch (const uno::Exception&)
         {