From 29d2b408adac5bd9ee73e1992f7a1405f22faa9e Mon Sep 17 00:00:00 2001
From: James Allen <james@sharelatex.com>
Date: Tue, 13 Feb 2018 08:43:00 +0000
Subject: [PATCH] Don't error when detaching from history with no sharejsDoc

---
 .../web/public/coffee/ide/editor/directives/aceEditor.coffee   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/services/web/public/coffee/ide/editor/directives/aceEditor.coffee b/services/web/public/coffee/ide/editor/directives/aceEditor.coffee
index 134a3629ab..a128ecacb5 100644
--- a/services/web/public/coffee/ide/editor/directives/aceEditor.coffee
+++ b/services/web/public/coffee/ide/editor/directives/aceEditor.coffee
@@ -428,7 +428,8 @@ define [
 						rendererData.lineHeight = editor.renderer.lineHeight
 
 				scope.$on '$destroy', () ->
-					detachFromAce(scope.sharejsDoc)
+					if scope.sharejsDoc?
+						detachFromAce(scope.sharejsDoc)
 
 				scope.$emit "#{scope.name}:inited", editor