diff --git a/main/admin/course_list.php b/main/admin/course_list.php
index 3be8c59b2b..80b926df35 100755
--- a/main/admin/course_list.php
+++ b/main/admin/course_list.php
@@ -334,14 +334,16 @@ if (isset($_POST['action'])) {
     switch ($_POST['action']) {
         // Delete selected courses
         case 'delete_courses':
-            $course_codes = $_POST['course'];
-            if (count($course_codes) > 0) {
-                foreach ($course_codes as $course_code) {
-                    CourseManager::delete_course($course_code);
+            if (!empty($_POST['course'])) {
+                $course_codes = $_POST['course'];
+                if (count($course_codes) > 0) {
+                    foreach ($course_codes as $course_code) {
+                        CourseManager::delete_course($course_code);
+                    }
                 }
-            }
 
-            Display::addFlash(Display::return_message(get_lang('Deleted')));
+                Display::addFlash(Display::return_message(get_lang('Deleted')));
+            }
             break;
     }
 }
diff --git a/main/admin/user_list.php b/main/admin/user_list.php
index 7b0a272464..e6cb824bb5 100755
--- a/main/admin/user_list.php
+++ b/main/admin/user_list.php
@@ -870,7 +870,7 @@ if (!empty($action)) {
                 exit;
                 break;
             case 'delete':
-                if (api_is_platform_admin()) {
+                if (api_is_platform_admin() && !empty($_POST['id'])) {
                     $number_of_selected_users = count($_POST['id']);
                     $number_of_affected_users = 0;
                     if (is_array($_POST['id'])) {