diff --git a/mozilla/dom/media/MediaEventSource.h b/mozilla/dom/media/MediaEventSource.h

index cd5ad25..aa31f53 100644

--- a/mozilla/dom/media/MediaEventSource.h

+++ b/mozilla/dom/media/MediaEventSource.h

@@ -339,8 +339,10 @@ public:

   }

   void Disconnect() {

-    mToken->Revoke();

-    mToken = nullptr;

+    if (mToken != nullptr) {

+      mToken->Revoke();

+      mToken = nullptr;

+    }

   }

 private: