Index: mozilla/layout/generic/nsSelection.cpp
===================================================================
RCS file: /cvsroot/mozilla/layout/generic/nsSelection.cpp,v
retrieving revision 3.236
diff -up -r3.236 mozilla/layout/generic/nsSelection.cpp
--- mozilla/layout/generic/nsSelection.cpp
+++ mozilla/layout/generic/nsSelection.cpp
@@ -6687,11 +6687,10 @@ struct nsScrollSelectionIntoViewEvent : 
   ~nsScrollSelectionIntoViewEvent() {}
 
   void HandleEvent() {
-    mTypedSelection->mScrollEventPosted = PR_FALSE;
-
     if (!mTypedSelection)
       return;
 
+    mTypedSelection->mScrollEventPosted = PR_FALSE;
     mTypedSelection->ScrollIntoView(mRegion, PR_TRUE);
   }