public function get_user_taken_sessions_count($userid) {
if (!array_key_exists($userid, $this->usertakensesscount)) {
- if ($this->pageparams->startdate && $this->pageparams->enddate) {
+ if (!empty($this->pageparams->startdate) && !empty($this->pageparams->enddate)) {
$this->usertakensesscount[$userid] = att_get_user_taken_sessions_count($this->id, $this->course->startdate, $userid, $this->cm, $this->pageparams->startdate, $this->pageparams->enddate);
} else {
$this->usertakensesscount[$userid] = att_get_user_taken_sessions_count($this->id, $this->course->startdate, $userid, $this->cm);