From dea50cbf6aca6d22f6c56d1acc616a5f0e087b53 Mon Sep 17 00:00:00 2001
From: Pale Moon <git-repo@palemoon.org>
Date: Sun, 10 Jun 2018 01:53:05 +0200
Subject: Add a nullcheck in DOMProxyHandler::EnsureExpandoObject

---
 dom/bindings/DOMJSProxyHandler.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dom/bindings/DOMJSProxyHandler.cpp b/dom/bindings/DOMJSProxyHandler.cpp
index f0ebf4385..e121ff65c 100644
--- a/dom/bindings/DOMJSProxyHandler.cpp
+++ b/dom/bindings/DOMJSProxyHandler.cpp
@@ -121,6 +121,10 @@ DOMProxyHandler::EnsureExpandoObject(JSContext* cx, JS::Handle<JSObject*> obj)
   nsISupports* native = UnwrapDOMObject<nsISupports>(obj);
   nsWrapperCache* cache;
   CallQueryInterface(native, &cache);
+  if (!cache) {
+    return expando;
+  }
+
   if (expandoAndGeneration) {
     cache->PreserveWrapper(native);
     expandoAndGeneration->expando.setObject(*expando);
-- 
cgit v1.2.3