Null check current doc before using it. b=344787 r+sr=bzbarsky

content/html/content/src/nsHTMLFormElement.cpp

@@ -932,11 +932,7 @@ nsHTMLFormElement::SubmitSubmission(nsIFormSubmission* aFormSubmission)
 
   // If there is no link handler, then we won't actually be able to submit.
   nsIDocument* doc = GetCurrentDoc();
-  if (!doc) {
-    // Nothing to do
-  }
-
-  nsCOMPtr<nsISupports> container = doc->GetContainer();
+  nsCOMPtr<nsISupports> container = doc ? doc->GetContainer() : nsnull;
   nsCOMPtr<nsILinkHandler> linkHandler(do_QueryInterface(container));
   if (!linkHandler) {
     mIsSubmitting = PR_FALSE;