1 files changed, 5 insertions, 2 deletions
diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index f33ded1c5f..5edf7dc4a5 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -4339,6 +4339,11 @@ WorkerPrivate::Constructor(JSContext* aCx,
     return nullptr;
   }
 
+  // From this point on (worker thread has been started) we
+  // must keep ourself alive. We can now only be cleared by
+  // ClearSelfAndParentEventTargetRef().
+  worker->mSelfRef = worker;
+
   worker->EnableDebugger();
 
   RefPtr<CompileScriptRunnable> compiler =
@@ -4348,8 +4353,6 @@ WorkerPrivate::Constructor(JSContext* aCx,
     return nullptr;
   }
 
-  worker->mSelfRef = worker;
-
   return worker.forget();
 }