--- sw/source/core/layout/tabfrm.cxx	2010-05-27 20:35:30.000000000 +0100
+++ sw/source/core/layout/tabfrm.cxx	2010-05-27 20:37:04.000000000 +0100
@@ -1625,7 +1625,8 @@
 #endif
                 }
             }
-            pCnt->GetUpper()->Calc();
+            if (const SwFrm* pUpper = pCnt->GetUpper())
+                pUpper->Calc();
         }
         // <--
         if( ! bAll && (*fnRect->fnYDiff)((pCnt->Frm().*fnRect->fnGetTop)(), nBottom) > 0 )