From a66555328b49c2f0dbe0976d738ead18c7ed86b4 Mon Sep 17 00:00:00 2001
From: Pavel Sokolov <pavel.m.sokolov@gmail.com>
Date: Thu, 5 Dec 2013 11:56:14 +0400
Subject: [PATCH] MDL-43199 assign: fix js error when expanding comments for
 non editing teachers in assign grading table

---
 mod/assign/module.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mod/assign/module.js b/mod/assign/module.js
index 66095522ec4..29814649434 100644
--- a/mod/assign/module.js
+++ b/mod/assign/module.js
@@ -150,9 +150,11 @@ M.mod_assign.init_grading_options = function(Y) {
             });
         }
         var showonlyactiveenrolelement = Y.one('#id_showonlyactiveenrol');
-        showonlyactiveenrolelement.on('change', function(e) {
+        if (showonlyactiveenrolelement) {
+            showonlyactiveenrolelement.on('change', function(e) {
             Y.one('form.gradingoptionsform').submit();
-        });
+            });
+        }
     });
 };