add guard before APP in middleware.js

react/features/local-recording/middleware.js

@@ -64,7 +64,8 @@ isFeatureEnabled
             }, 10000));
         };
 
-        APP.keyboardshortcut.registerShortcut('L', null, () => {
+        typeof APP === 'object' && typeof APP.keyboardshortcut === 'object'
+            && APP.keyboardshortcut.registerShortcut('L', null, () => {
                 sendAnalytics(createShortcutEvent('local.recording'));
                 dispatch(toggleDialog(LocalRecordingInfoDialog));
             }, 'keyboardShortcuts.localRecording');