Fix crash while document is going away (bug 168013), r=sicking@bugmail.cc, sr=sfraser@netscape.com

content/html/content/src/nsHTMLInputElement.cpp

@@ -1180,17 +1180,21 @@ nsHTMLInputElement::Select()
     // If the DOM event was not canceled (e.g. by a JS event handler
     // returning false)
     if (status == nsEventStatus_eIgnore) {
+      if (presContext) {
         nsCOMPtr<nsIEventStateManager> esm;
-      if (NS_OK == presContext->GetEventStateManager(getter_AddRefs(esm))) {
+        presContext->GetEventStateManager(getter_AddRefs(esm));
+        if (esm) {
+          // XXX Fix for bug 135345 - ESM currently does not check to see if we
+          // have focus before attempting to set focus again and may cause
+          // infinite recursion.  For now check if we have focus and do not set
+          // focus again if already focused.
           PRInt32 currentState;
-        //XXX Fix for bug 135345 - ESM currently does not check to see if we have
-        //focus before attempting to set focus again and may cause infinite recursion.
-        //For now check if we have focus and do not set focus again if already focused.
           esm->GetContentState(this, currentState);
           if (!(currentState & NS_EVENT_STATE_FOCUS)) {
             esm->SetContentState(this, NS_EVENT_STATE_FOCUS);
           }
         }
+      }
 
       nsIFormControlFrame* formControlFrame = GetFormControlFrame(PR_TRUE);