diff --git a/event_handler.php b/event_handler.php
index b90f22b..28ca85a 100644
--- a/event_handler.php
+++ b/event_handler.php
@@ -187,7 +187,8 @@ if (isset($_POST['action'])) {
                 $psw = "null";
             }
 
-            $new_coach_id = user::create_user($_POST['ua_name'], $psw, $_POST['authorities']);
+            $authorities = isset($_POST['authorities']) ? $_POST['authorities'] : array();
+            $new_coach_id = user::create_user($_POST['ua_name'], $psw, $authorities);
             log::register('new_coach', $new_coach_id);
             header("Location: /admin/coaches");
             break;
@@ -200,7 +201,8 @@ if (isset($_POST['action'])) {
                 $psw = "-1"; //ez jelzi h nem szabad updatelni
             }
 
-            user::update_user($_POST['ua_name'], $psw, isset($_POST['ua_admin']), $_POST['ua_id'], $_POST['authorities']);
+            $authorities = isset($_POST['authorities']) ? $_POST['authorities'] : array();
+            user::update_user($_POST['ua_name'], $psw, isset($_POST['ua_admin']), $_POST['ua_id'], $authorities);
             log::register('update_coach', $_POST['ua_id']);
             header("Location: /admin/coaches/".$_POST['ua_id']);
             break;