From 114f28f48e12c81ec33deb599714c3b5e9c1ae11 Mon Sep 17 00:00:00 2001
From: Kevin Jahns <kevin.jahns@pm.me>
Date: Sat, 31 Oct 2020 00:34:07 +0100
Subject: [PATCH] log error when removing eventhandler that doesnt exist -
 implements #246

---
 src/utils/EventHandler.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/utils/EventHandler.js b/src/utils/EventHandler.js
index ea50b0f1..c54a5048 100644
--- a/src/utils/EventHandler.js
+++ b/src/utils/EventHandler.js
@@ -51,7 +51,12 @@ export const addEventHandlerListener = (eventHandler, f) =>
  * @function
  */
 export const removeEventHandlerListener = (eventHandler, f) => {
-  eventHandler.l = eventHandler.l.filter(g => f !== g)
+  const l = eventHandler.l
+  const len = l.length
+  eventHandler.l = l.filter(g => f !== g)
+  if (len === eventHandler.l.length) {
+    console.error('[yjs] Tried to remove event handler that doesn\'t exist.')
+  }
 }
 
 /**