diff --git a/type/ILB_Sem_tutoria_2014/certificate.php b/type/ILB_Sem_tutoria_2014/certificate.php
index cebf47e..04ee4bc 100644
--- a/type/ILB_Sem_tutoria_2014/certificate.php
+++ b/type/ILB_Sem_tutoria_2014/certificate.php
@@ -38,9 +38,12 @@ require_once("$CFG->dirroot/enrol/locallib.php");
 $cc = new completion_completion(array('userid'=>$USER->id, 'course'=>$course->id));
 
 $enrol_manager = new course_enrolment_manager($PAGE, $course);
-$user_enrol = end($enrol_manager->get_user_enrolments($USER->id));
 
-$start_date = $user_enrol->timestart;
+$enrolments = $enrol_manager->get_user_enrolments($USER->id);
+
+//$user_enrol = isempty($enrolments)? end();
+
+$start_date = (empty($enrolments))? $enrolments[0]->timestart : 0;
 $end_date   = $cc->timecompleted;
 $cert_date = $end_date;