Add a null check.

git-svn-id: svn://10.0.0.236/trunk@69473 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/forms/nsFileControlFrame.cpp

@@ -611,7 +611,8 @@ NS_IMETHODIMP nsFileControlFrame::GetProperty(nsIAtom* aName, nsString& aValue)
 
 #ifndef DEBUG_NEWFRAME
   if (nsHTMLAtoms::value == aName) {
-    mTextFrame->GetTextControlFrameState(aValue);
+    if (mTextFrame)
+      mTextFrame->GetTextControlFrameState(aValue);
   }
 #endif
   return NS_OK;