# HG changeset patch
# User Boris Zbarsky <bzbarsky@mit.edu>
# Date 1519925552 18000
# Node ID f9d520b575f14558f24e060e663a92b84b72bb54
# Parent  1f9e787dc3e960b108827c06338ac88c2ec9aed5
Bug 1438326.  Don't try to enqueue custom element callbacks when the custom element definition has been unlinked.  r=smaug

MozReview-Commit-ID: FLf6CJcpcVQ

diff --git a/dom/base/CustomElementRegistry.cpp b/dom/base/CustomElementRegistry.cpp
--- a/dom/base/CustomElementRegistry.cpp
+++ b/dom/base/CustomElementRegistry.cpp
@@ -421,16 +421,21 @@ CustomElementRegistry::EnqueueLifecycleC
 {
   CustomElementDefinition* definition = aDefinition;
   if (!definition) {
     definition = aCustomElement->GetCustomElementDefinition();
     if (!definition ||
         definition->mLocalName != aCustomElement->NodeInfo()->NameAtom()) {
       return;
     }
+
+    if (!definition->mCallbacks) {
+      // definition has been unlinked.  Don't try to mess with it.
+      return;
+    }
   }
 
   auto callback =
     CreateCustomElementCallback(aType, aCustomElement, aArgs,
                                 aAdoptedCallbackArgs, definition);
   if (!callback) {
     return;
   }