diff --git a/dom/media/MediaDecoder.cpp b/dom/media/MediaDecoder.cpp
index 7b8b4b7eeed4..0b711718c737 100644
--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@@ -1862,9 +1862,8 @@ void
 MediaDecoder::ConstructMediaTracks()
 {
   MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(!IsShutdown());
 
-  if (mMediaTracksConstructed || !mInfo) {
+  if (IsShutdown() || mMediaTracksConstructed || !mInfo) {
     return;
   }