From 625a99e7f05a94d4d58b09cec074bf3ddc5a753d Mon Sep 17 00:00:00 2001
From: jmoenig <jens@moenig.org>
Date: Fri, 19 Jun 2020 18:34:45 +0200
Subject: [PATCH] tweaked filling in default values

---
 src/blocks.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/blocks.js b/src/blocks.js
index e28c938c..9e7dde7f 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -3234,7 +3234,7 @@ BlockMorph.prototype.setSelector = function (aSelector, inputOffset = 0) {
         slots[0].defaults = this.defaults;
     } else {
         for (i = 0; i < this.defaults.length; i += 1) {
-            if (this.defaults[i] !== null) {
+            if (this.defaults[i] !== null && slots[i].setContents) {
                 slots[i].setContents(this.defaults[i]);
             }
         }