From 333591d0877f7feda21795e5ffe1eca70d72e8d6 Mon Sep 17 00:00:00 2001
From: James Allen <james@sharelatex.com>
Date: Fri, 12 Jun 2015 10:16:33 +0100
Subject: [PATCH] Extra null check

---
 services/document-updater/app/coffee/UpdateManager.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/services/document-updater/app/coffee/UpdateManager.coffee b/services/document-updater/app/coffee/UpdateManager.coffee
index feff628453..8765c330ff 100644
--- a/services/document-updater/app/coffee/UpdateManager.coffee
+++ b/services/document-updater/app/coffee/UpdateManager.coffee
@@ -54,7 +54,7 @@ module.exports = UpdateManager =
 			UpdateManager.applyUpdates project_id, doc_id, updates, callback
 
 	applyUpdates: (project_id, doc_id, updates, callback = (error) ->) ->
-		for update in updates
+		for update in updates or []
 			UpdateManager._sanitizeUpdate update
 		ShareJsUpdateManager.applyUpdates project_id, doc_id, updates, (error, updatedDocLines, version) ->
 			return callback(error) if error?