diff --git a/client/modules/IDE/pages/MobileIDEView.jsx b/client/modules/IDE/pages/MobileIDEView.jsx
index ac73644d..2aa653b2 100644
--- a/client/modules/IDE/pages/MobileIDEView.jsx
+++ b/client/modules/IDE/pages/MobileIDEView.jsx
@@ -75,7 +75,6 @@ const isUserOwner = ({ project, user }) =>
 
 // TODO: This could go into <Editor />
 const handleGlobalKeydown = (props, cmController) => (e) => {
-  alert('haha');
   const {
     user, project, ide,
     setAllAccessibleOutput,
diff --git a/client/utils/custom-hooks.js b/client/utils/custom-hooks.js
index cf6c0130..7543555c 100644
--- a/client/utils/custom-hooks.js
+++ b/client/utils/custom-hooks.js
@@ -55,5 +55,5 @@ export const useEffectWithComparison = (fn, props) => {
 
 export const useEventListener = (event, callback, useCapture = false) => useEffect(() => {
   document.addEventListener(event, callback, useCapture);
-  return document.removeEventListener(event, callback, useCapture);
+  return () => document.removeEventListener(event, callback, useCapture);
 }, []);