diff --git a/mozilla/docshell/base/nsDocShell.cpp b/mozilla/docshell/base/nsDocShell.cpp
index a7c8f88ec2c..2c43709bb34 100644
--- a/mozilla/docshell/base/nsDocShell.cpp
+++ b/mozilla/docshell/base/nsDocShell.cpp
@@ -1247,9 +1247,10 @@ NS_IMETHODIMP nsDocShell::Destroy()
    if(docShellParentAsNode)
       docShellParentAsNode->RemoveChild(this);
 
+   mContentViewer = nsnull;
+
    DestroyChildren();
 
-   mContentViewer = nsnull;
    mDocLoader = nsnull;
    mDocLoaderObserver = nsnull;
    mParentWidget = nsnull;