Exception - array_key_exists(): Argument #2 ($array) must be of type array, null given

More information about this error

Debug info:

Error code: generalexceptionmessage×Dismiss this notification

Stack trace:

line 2187 of /lib/grade/grade_category.php: TypeError thrown

line 2042 of /lib/grade/grade_category.php: call to grade_category->get_children()

line 2339 of /grade/lib.php: call to grade_category::fetch_course_tree()

line 148 of /grade/report/grader/lib.php: call to grade_tree->__construct()

line 118 of /grade/report/grader/index.php: call to grade_report_grader->__construct() 

while (array_key_exists($sortorder, $cats[$cat->parent]->children))

{

    //debugging("$sortorder exists in cat loop");

    $sortorder++;

    $cats[$cat->parent]->children[$sortorder] = &$cats[$catid];

}

if (!is_null($cats[$cat->parent])) {

    while (array_key_exists($sortorder, $cats[$cat->parent]->children)) {

        //debugging("$sortorder exists in cat loop");

        $sortorder++;

        $cats[$cat->parent]->children[$sortorder] = &$cats[$catid];

    }

}