Merge branch '1.11.x' of github.com:chamilo/chamilo-lms into 1.11.x

main/gradebook/all_my_gradebooks.php

@@ -51,7 +51,11 @@ $userCoursesList = CourseManager::get_courses_list_by_user_id ($user_id, true, f
 foreach ($userCoursesList as $course) {
     $course_code = $course['code'];
     $stud_id = $user_id;
-    $session_id = $course['session_id'];
+    if (isset($course['session_id']) && $course['session_id'] > 0) {
+        $session_id = $course['session_id'];
+    } else {
+        $session_id = 0;
+    }
     $course_id = $course['real_id'];
     $courseInfo = api_get_course_info($course_code);
 
@@ -121,3 +125,5 @@ $showTitle = true;
     }
 }
 
+Display::display_footer();
+

main/inc/lib/chamilo_session.class.php

@@ -52,9 +52,7 @@ class ChamiloSession extends System\Session
      */
     public static function session_lifetime()
     {
-        global $_configuration;
-
-        return $_configuration['session_lifetime'];
+        return api_get_configuration_value('session_lifetime');
     }
 
     /**