From 8d148dd8661217fe42245969328d9d87991f1bd0 Mon Sep 17 00:00:00 2001
From: Adam Olley <adam.olley@netspot.com.au>
Date: Fri, 31 May 2013 09:29:56 +0930
Subject: [PATCH] MDL-39947 mod_forum: Add safety check to variable assignment
 when counting unread posts

---
 mod/forum/lib.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index d9f28beff99..f1c07ef10a4 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -6717,7 +6717,11 @@ function forum_tp_count_forum_unread_posts($cm, $course) {
         $modinfo->groups = groups_get_user_groups($course->id, $USER->id);
     }
 
-    $mygroups = $modinfo->groups[$cm->groupingid];
+    if (array_key_exists($cm->groupingid, $modinfo->groups)) {
+        $mygroups = $modinfo->groups[$cm->groupingid];
+    } else {
+        $mygroups = false; // Will be set below
+    }
 
     // add all groups posts
     if (empty($mygroups)) {