diff --git a/sw/source/core/layout/findfrm.cxx b/sw/source/core/layout/findfrm.cxx
index 50f6107..edb3a5a 100644
--- a/sw/source/core/layout/findfrm.cxx
+++ b/sw/source/core/layout/findfrm.cxx
@@ -722,10 +722,11 @@ SwFrm *SwFrm::_FindNext()
     if ( !bIgnoreTab && pThis->IsInTab() )
     {
         SwLayoutFrm *pUp = pThis->GetUpper();
-        while ( !pUp->IsCellFrm() )
+        while ( pUp && !pUp->IsCellFrm() )
             pUp = pUp->GetUpper();
         OSL_ENSURE( pUp, "Cntnt in Tabelle aber nicht in Zelle." );
-        SwFrm* pNxt = ((SwCellFrm*)pUp)->GetFollowCell();
+        
+        SwFrm* pNxt = (pUp)?((SwCellFrm*)pUp)->GetFollowCell():0;
         if ( pNxt )
             pNxt = ((SwCellFrm*)pNxt)->ContainsCntnt();
         if ( !pNxt )
@@ -1083,10 +1084,10 @@ SwFrm *SwFrm::_FindPrev()
         if ( !bIgnoreTab && pThis->IsInTab() )
         {
             SwLayoutFrm *pUp = pThis->GetUpper();
-            while ( !pUp->IsCellFrm() )
+            while ( pUp && !pUp->IsCellFrm() )
                 pUp = pUp->GetUpper();
             OSL_ENSURE( pUp, "Cntnt in table but not in cell." );
-            if ( pUp->IsAnLower( pPrvCnt ) )
+            if ( pUp && pUp->IsAnLower( pPrvCnt ) )
                 return pPrvCnt;
         }
         else
@@ -1428,21 +1429,26 @@ void SwFrm::SetDirFlags( sal_Bool bVert )
 SwLayoutFrm* SwFrm::GetNextCellLeaf( MakePageType )
 {
     SwFrm* pTmpFrm = this;
-    while ( !pTmpFrm->IsCellFrm() )
+    while ( pTmpFrm && !pTmpFrm->IsCellFrm() )
         pTmpFrm = pTmpFrm->GetUpper();
 
     OSL_ENSURE( pTmpFrm, "SwFrm::GetNextCellLeaf() without cell" );
-    return ((SwCellFrm*)pTmpFrm)->GetFollowCell();
+    if (pTmpFrm)
+        return ((SwCellFrm*)pTmpFrm)->GetFollowCell();
+    return NULL;
+         
 }
 
 SwLayoutFrm* SwFrm::GetPrevCellLeaf( MakePageType )
 {
     SwFrm* pTmpFrm = this;
-    while ( !pTmpFrm->IsCellFrm() )
+    while ( pTmpFrm && !pTmpFrm->IsCellFrm() )
         pTmpFrm = pTmpFrm->GetUpper();
 
     OSL_ENSURE( pTmpFrm, "SwFrm::GetNextPreviousLeaf() without cell" );
-    return ((SwCellFrm*)pTmpFrm)->GetPreviousCell();
+    if (pTmpFrm)
+        return ((SwCellFrm*)pTmpFrm)->GetPreviousCell();
+    return NULL;
 }
 
 static SwCellFrm* lcl_FindCorrespondingCellFrm( const SwRowFrm& rOrigRow,