From 4063900e2bcd395c324ca54163205e25e0a02bb9 Mon Sep 17 00:00:00 2001
From: Michael Aherne <michael.aherne@strath.ac.uk>
Date: Fri, 8 Jul 2016 10:48:00 +0100
Subject: [PATCH] MDL-55161 assign: Check for existence of gradebook feedback
 plugin

---
 mod/assign/locallib.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index cc1b7425ef9..bf1c412767e 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -7444,6 +7444,10 @@ class assign {
         // Check if default gradebook feedback is visible and enabled.
         $gradebookfeedbackplugin = $this->get_feedback_plugin_by_type($gradebookplugin);
 
+        if (empty($gradebookfeedbackplugin)) {
+            return false;
+        }
+
         if ($gradebookfeedbackplugin->is_visible() && $gradebookfeedbackplugin->is_enabled()) {
             return true;
         }