From 785a778ef47cd7d5412c6034ff044c0c4670e2a7 Mon Sep 17 00:00:00 2001
From: Robert O'Callahan <roc@ocallahan.org>
Date: Wed, 10 Dec 2008 15:57:27 +0100
Subject: [PATCH] Bug 468753 - Startup crash in
 nsViewManager::ProcessSynthMouseMoveEvent; r+sr=dbaron

---
 view/src/nsViewManager.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/view/src/nsViewManager.cpp b/view/src/nsViewManager.cpp
index 16f6b6ccec98..7fa29226052f 100644
--- a/view/src/nsViewManager.cpp
+++ b/view/src/nsViewManager.cpp
@@ -2415,7 +2415,10 @@ nsViewManager::ProcessSynthMouseMoveEvent(PRBool aFromScroll)
   event.time = PR_IntervalNow();
   // XXX set event.isShift, event.isControl, event.isAlt, event.isMeta ?
 
-  pointVM->GetViewObserver()->DispatchSynthMouseMove(&event, !aFromScroll);
+  nsCOMPtr<nsIViewObserver> observer = pointVM->GetViewObserver();
+  if (observer) {
+    observer->DispatchSynthMouseMove(&event, !aFromScroll);
+  }
 
   if (!aFromScroll)
     mSynthMouseMoveEvent.Forget();