tdf#137318 sw_redlinehide: fix assert on export moz715138-3.doc to ODF

(regression from 31f51598fd08c2b76583a1baad0c0d6d4b336664)

Change-Id: Ia3e5d25e46da3016d1af9f5e1dbdcfc6bdd46457
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127145
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

1 files changed, 7 insertions, 3 deletions

diff --git a/sw/source/core/txtnode/ndtxt.cxx b/sw/source/core/txtnode/ndtxt.cxx
index 581c7f344a74..872e4cee96db 100644
--- a/sw/source/core/txtnode/ndtxt.cxx
+++ b/sw/source/core/txtnode/ndtxt.cxx
@@ -878,9 +878,13 @@ void CheckResetRedlineMergeFlag(SwTextNode & rNode, Recreate const eRecreateMerg
             assert(rFirstNode.GetIndex() <= rNode.GetIndex());
             pFrame->SetMergedPara(sw::CheckParaRedlineMerge(
                         *pFrame, rFirstNode, eMode));
-            assert(pFrame->GetMergedPara());
-            assert(pFrame->GetMergedPara()->listener.IsListeningTo(&rNode));
-            assert(rNode.GetIndex() <= pFrame->GetMergedPara()->pLastNode->GetIndex());
+            // there is no merged para in case the deleted node had one but
+            // nothing was actually hidden
+            if (pFrame->GetMergedPara())
+            {
+                assert(pFrame->GetMergedPara()->listener.IsListeningTo(&rNode));
+                assert(rNode.GetIndex() <= pFrame->GetMergedPara()->pLastNode->GetIndex());
+            }
             eMode = sw::FrameMode::New; // Existing is not idempotent!
         }
     }