--- sw/source/core/unocore/unorefmk.cxx	2010-11-25 20:17:35.000000000 +0100
+++ sw/source/core/unocore/unorefmk.cxx-gil	2011-03-03 16:09:51.000000000 +0100
@@ -261,8 +261,10 @@
     }
     else
     {
-        pTxtAttr = rPam.GetNode()->GetTxtNode()->GetTxtAttrForCharAt(
-                rPam.GetPoint()->nContent.GetIndex() - 1, RES_TXTATR_REFMARK);
+        SwTxtNode *pTxtNd = rPam.GetNode()->GetTxtNode();
+        OSL_ASSERT(pTxtNd);
+        pTxtAttr = pTxtNd ? rPam.GetNode()->GetTxtNode()->GetTxtAttrForCharAt(
+                rPam.GetPoint()->nContent.GetIndex() - 1, RES_TXTATR_REFMARK) : NULL;
     }
 
     if (!pTxtAttr)