on line #277, return null instead of throwing an error

diff --git a/mod/lesson/lib.php b/mod/lesson/lib.php
index 51874e59cee8673c7fd3f2abfb31507ea6c60324..aa300ad067e2f97fda6f98e23190a4394d4b6033 100644 (file)
--- a/mod/lesson/lib.php
+++ b/mod/lesson/lib.php
@@ -274,7 +274,7 @@ function lesson_grades($lessonid) {
     global $CFG;
 
        if (!$lesson = get_record("lesson", "id", $lessonid)) {
-               error("Lesson record not found");
+               return NULL;
        }
     if ($lesson->usemaxgrade) {
         $grades = get_records_sql_menu("SELECT userid,MAX(grade) FROM {$CFG->prefix}lesson_grades WHERE