diff --git a/HISTORY.md b/HISTORY.md
index cdf1cd79..8ba8c918 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -7,11 +7,13 @@
 * **Notable Fixes:**
     * setting a clone's rotation coordinates shadows its inherited costumes
     * preserve embedded inputs when JOINing a nested expression with an empty list
+    * improved loading custom block categories
 * **Documentation Updates:**
 * **Translation Updates:**
 
 ### 2021-12-20
 * blocks, threads: preserve embedded inputs when JOINing a nested expression with an empty list
+* objects: improved loading custom block categories
 
 ### 2021-12-18
 * new dev version
diff --git a/snap.html b/snap.html
index eb3d85a1..c61d6011 100755
--- a/snap.html
+++ b/snap.html
@@ -18,7 +18,7 @@
         <script src="src/widgets.js?version=2021-17-09"></script>
         <script src="src/blocks.js?version=2021-12-20"></script>
         <script src="src/threads.js?version=2021-12-20"></script>
-        <script src="src/objects.js?version=2021-12-18"></script>
+        <script src="src/objects.js?version=2021-12-20"></script>
         <script src="src/scenes.js?version=2021-11-24"></script>
         <script src="src/gui.js?version=2021-12-18"></script>
         <script src="src/paint.js?version=2021-07-05"></script>
diff --git a/src/objects.js b/src/objects.js
index 1e5cdb72..bbd3bb09 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -87,7 +87,7 @@ BlockVisibilityDialogMorph*/
 
 /*jshint esversion: 6*/
 
-modules.objects = '2021-December-18';
+modules.objects = '2021-December-20';
 
 var SpriteMorph;
 var StageMorph;
@@ -172,7 +172,9 @@ SpriteMorph.prototype.allCategories = function () {
 };
 
 SpriteMorph.prototype.blockColorFor = function (category) {
-    return this.blockColor[category] || this.customCategories.get(category);
+    return this.blockColor[category] ||
+        this.customCategories.get(category) ||
+        this.blockColor.other;
 };
 
 SpriteMorph.prototype.paletteColor = new Color(55, 55, 55);