--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -3290,18 +3290,16 @@ MediaDecoderStateMachine::BeginShutdown(
   return InvokeAsync(OwnerThread(), this, __func__,
                      &MediaDecoderStateMachine::Shutdown);
 }
 
 RefPtr<ShutdownPromise>
 MediaDecoderStateMachine::FinishShutdown()
 {
   MOZ_ASSERT(OnTaskQueue());
-  MOZ_ASSERT(mState == DECODER_STATE_SHUTDOWN,
-             "How did we escape from the shutdown state?");
   DECODER_LOG("Shutting down state machine task queue");
   return OwnerThread()->BeginShutdown();
 }
 
 void
 MediaDecoderStateMachine::RunStateMachine()
 {
   MOZ_ASSERT(OnTaskQueue());