commit d4e320f4bf02
Author: Jason Laster <jason.laster.11@gmail.com>
Date:   Thu Oct 19 07:57:00 2017 -0400

    Bug 1409101 - Editor is occasionally empty. r=jdescottes, a=ritu
---
 devtools/client/debugger/new/debugger.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git devtools/client/debugger/new/debugger.js devtools/client/debugger/new/debugger.js
index a96351f65acf..dd8b81c06aec 100644
--- devtools/client/debugger/new/debugger.js
+++ devtools/client/debugger/new/debugger.js
@@ -24187,6 +24187,9 @@ return /******/ (function(modules) { // webpackBootstrap
 	    var selectedSource = nextProps.selectedSource,
 	        selectedLocation = nextProps.selectedLocation;
 
+	    if (!this.state.editor) {
+	        return;
+	    }
 
 	    if (nextProps.startPanelSize !== this.props.startPanelSize || nextProps.endPanelSize !== this.props.endPanelSize) {
 	      this.state.editor.codeMirror.setSize();