diff --git a/chrome/background/background.mjs b/chrome/background/background.mjs
index 992f2565..2e8a8228 100644
--- a/chrome/background/background.mjs
+++ b/chrome/background/background.mjs
@@ -344,7 +344,6 @@ chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
 
     sendSources(frame);
   } else {
-    sendResponse('unknown');
     return;
   }
 
diff --git a/chrome/player/main.mjs b/chrome/player/main.mjs
index f5b25608..24318afb 100644
--- a/chrome/player/main.mjs
+++ b/chrome/player/main.mjs
@@ -39,7 +39,6 @@ if (EnvUtils.isExtension()) {
           recieveSources(request, sendResponse);
           return true;
         } else {
-          sendResponse('unknown');
           return;
         }