MDL-18322: Fix debug warning on course view page when forum has grouping set

diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 673a8f64b079c008ac8b07e0a3717feb5502305f..7225bdea02f703cb99255efc341c459c849d21a6 100644 (file)
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -2348,7 +2348,11 @@ function forum_count_discussions($forum, $cm, $course) {
     if (empty($CFG->enablegroupings)) {
         $mygroups = $modinfo->groups[0];
     } else {
-        $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