diff --git a/mozilla/layout/tables/nsCellMap.cpp b/mozilla/layout/tables/nsCellMap.cpp
index 745562c8eba..04747677dfb 100644
--- a/mozilla/layout/tables/nsCellMap.cpp
+++ b/mozilla/layout/tables/nsCellMap.cpp
@@ -328,7 +328,9 @@ nsTableCellMap::Synchronize(nsTableFrame* aTableFrame)
     if (map) {
       if (!maps.AppendElement(map)) {
         delete map;
+        map = nsnull;
         NS_WARNING("Could not AppendElement");
+        break;
       }
     }
   }