From 8706cd9e30199dfda3c2f28d568025ad4ab7260c Mon Sep 17 00:00:00 2001
From: Chris Malley <cmalley@pixelzoom.com>
Date: Thu, 30 May 2019 13:20:05 -0600
Subject: [PATCH] don't assign onPlateProperty if it has been disposed,
 https://github.com/phetsims/axon/issues/242

---
 js/common/model/TermCreator.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/js/common/model/TermCreator.js b/js/common/model/TermCreator.js
index 1e7d8226..b07eeb2f 100644
--- a/js/common/model/TermCreator.js
+++ b/js/common/model/TermCreator.js
@@ -400,7 +400,9 @@ define( function( require ) {
       // ORDER IS VERY IMPORTANT HERE!
       var cell = this.plate.removeTerm( term );
       this.termsOnPlate.remove( term );
-      term.onPlateProperty.value = false;
+      if ( !term.onPlateProperty.isDisposed ) {
+        term.onPlateProperty.value = false;
+      }
       return cell;
     },