Avoiding warnings messages

main/exercice/exercise.lib.php

@@ -1478,7 +1478,11 @@ function get_best_average_score_by_exercise($exercise_id, $course_code, $session
         //We asume that all exe_weighting
         //$avg_score = show_score( $avg_score / count($user_results) , $result['exe_weighting']);
         //$avg_score = ($avg_score / count($user_results));
-        $avg_score = float_format($avg_score / $user_count, 1) * 100;
+        if(!empty($user_count)) {
+            $avg_score = float_format($avg_score / $user_count, 1) * 100;
+        } else {
+            $avg_score = 0;
+        }
     }
     return $avg_score;
 }

main/inc/lib/tracking.lib.php

@@ -1876,6 +1876,8 @@ class Tracking {
          * @return  string  html code
          */
         function show_user_progress($user_id, $session_id = 0, $extra_params = '', $show_courses = true) {
+            require_once api_get_path(LIBRARY_PATH).'sessionmanager.lib.php';
+            
             global $_configuration;
             $tbl_course_user            = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
             $tbl_access_rel_course      = Database :: get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);