Fix pagination

main/auth/courses.php

@@ -61,7 +61,8 @@ if (isset($_GET['action']) && in_array($_GET['action'], $actions)) {
     $action = Security::remove_XSS($_GET['action']);
 }
 
-$categoryCode = isset($_GET['category_code']) ? $_GET['category_code'] : 'ALL';
+$categoryCode = isset($_GET['category_code']) && !empty($_GET['category_code']) ? $_GET['category_code'] : 'ALL';
+
 $nameTools = CourseCategory::getCourseCatalogNameTools($action);
 if (empty($nameTools)) {
     $nameTools = get_lang('CourseManagement');

main/inc/lib/course_category.lib.php

@@ -577,7 +577,7 @@ class CourseCategory
      * @param string $searchTerm
      * @return int
      */
-    public static function countCoursesInCategory($category_code = "", $searchTerm = '')
+    public static function countCoursesInCategory($category_code = '', $searchTerm = '')
     {
         $tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
         $categoryCode = Database::escape_string($category_code);