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: