--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -1442,20 +1442,19 @@ private:
 
   // Update the seek target's time before resolving this seek task, the updated
   // time will be used in the MDSM::SeekCompleted() to update the MDSM's position.
   void UpdateSeekTargetTime()
   {
     RefPtr<MediaData> data = VideoQueue().PeekFront();
     if (data) {
       mSeekJob.mTarget->SetTime(TimeUnit::FromMicroseconds(data->mTime));
-    } else if (VideoQueue().AtEndOfStream()) {
+    } else {
+      MOZ_ASSERT(VideoQueue().AtEndOfStream());
       mSeekJob.mTarget->SetTime(mDuration);
-    } else {
-      MOZ_ASSERT(false, "No data!");
     }
   }
 
   void FinishSeek()
   {
     MOZ_ASSERT(!NeedMoreVideo());
     UpdateSeekTargetTime();
     auto time = mSeekJob.mTarget->GetTime().ToMicroseconds();