From 5515b1edc376d811caa36f195bcb41125c0ff84c Mon Sep 17 00:00:00 2001
From: Zak Kolar <zakkolar@users.noreply.github.com>
Date: Fri, 31 Dec 2021 21:40:54 -0600
Subject: [PATCH] fix changeBlockVisibility

---
 src/objects.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/objects.js b/src/objects.js
index bbd3bb09..56a091f5 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -3256,7 +3256,8 @@ SpriteMorph.prototype.isDisablingBlock = function (aBlock) {
 };
 
 SpriteMorph.prototype.changeBlockVisibility = function (aBlock, hideIt, quick) {
-    var ide, dict, cat;
+    var ide = this.parentThatIsA(IDE_Morph),
+        dict, cat;
     if (aBlock.isCustomBlock) {
         (aBlock.isGlobal ? aBlock.definition
             : this.getMethod(aBlock.semanticSpec)