--- a/xpcom/build/XPCOMInit.cpp
+++ b/xpcom/build/XPCOMInit.cpp
@@ -848,20 +848,22 @@ ShutdownXPCOM(nsIServiceManager* aServMg
 
     // This must happen after the shutdown of media and widgets, which
     // are triggered by the NS_XPCOM_SHUTDOWN_OBSERVER_ID notification.
     NS_ProcessPendingEvents(thread);
     gfxPlatform::ShutdownLayersIPC();
 
     mozilla::scache::StartupCache::DeleteSingleton();
     if (observerService)
+    {
       mozilla::KillClearOnShutdown(ShutdownPhase::ShutdownThreads);
       observerService->NotifyObservers(nullptr,
                                        NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID,
                                        nullptr);
+    }
 
     gXPCOMThreadsShutDown = true;
     NS_ProcessPendingEvents(thread);
 
     // Shutdown the timer thread and all timers that might still be alive before
     // shutting down the component manager
     nsTimerImpl::Shutdown();