--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -868,16 +868,21 @@ void HTMLMediaElement::AbortExistingLoad
 #endif
   // Abort any already-running instance of the resource selection algorithm.
   mLoadWaitStatus = NOT_WAITING;
 
   // Set a new load ID. This will cause events which were enqueued
   // with a different load ID to silently be cancelled.
   mCurrentLoadID++;
 
+  if (mChannelLoader) {
+    mChannelLoader->Cancel();
+    mChannelLoader = nullptr;
+  }
+
   bool fireTimeUpdate = false;
 
   // When aborting the existing loads, empty the objects in audio track list and
   // video track list, no events (in particular, no removetrack events) are
   // fired as part of this. Ending MediaStream sends track ended notifications,
   // so we empty the track lists prior.
   AudioTracks()->EmptyTracks();
   VideoTracks()->EmptyTracks();