--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -1049,16 +1049,21 @@ AudioChannelService::RefreshAgentsAudioF
   }
 }
 
 void
 AudioChannelService::AudioChannelWindow::RequestAudioFocus(AudioChannelAgent* aAgent)
 {
   MOZ_ASSERT(aAgent);
 
+  // Don't need to check audio focus for window-less agent.
+  if (!aAgent->Window()) {
+    return;
+  }
+
   // We already have the audio focus. No operation is needed.
   if (mOwningAudioFocus) {
     return;
   }
 
   // Only foreground window can request audio focus, but it would still own the
   // audio focus even it goes to background. Audio focus would be abandoned
   // only when other foreground window starts audio competing.