From f6e609f46e5459ac0d0fa4f362ea443906e71d4e Mon Sep 17 00:00:00 2001
From: chrisklus <christopher.klusendorf@colorado.edu>
Date: Mon, 25 Feb 2019 11:18:36 -0700
Subject: [PATCH] Remove this reference, see
 https://github.com/phetsims/energy-forms-and-changes/issues/220 and
 https://github.com/phetsims/energy-forms-and-changes/issues/219

---
 js/systems/view/TeaKettleNode.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/systems/view/TeaKettleNode.js b/js/systems/view/TeaKettleNode.js
index e1d3801c..9afd6e14 100644
--- a/js/systems/view/TeaKettleNode.js
+++ b/js/systems/view/TeaKettleNode.js
@@ -97,7 +97,7 @@ define( require => {
 
       // make the tea kettle & stand transparent when the energy chunks are visible
       energyChunksVisibleProperty.link( chunksVisible => {
-        if ( this.teaKettle.activeProperty.get() ) {
+        if ( teaKettle.activeProperty.get() ) {
           const opacity = chunksVisible ? 0.7 : 1;
           teaKettleImageNode.setOpacity( opacity );
           burnerStandNode.setOpacity( opacity );