diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 270aceffdbc..c33710c4933 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -1280,7 +1280,7 @@ function set_current_group($courseid, $groupid) {
 function get_current_group($courseid, $full=false) {
     global $SESSION, $USER;
 
-    if (empty($SESSION->currentgroup[$courseid])) {
+    if (!isset($SESSION->currentgroup[$courseid])) {
         if (empty($USER->groupmember[$courseid])) {
             return 0;
         } else {