diff --git a/app/views/resources/room_planning/booking_plan.php b/app/views/resources/room_planning/booking_plan.php
index beb19426a4d65e2004ad073d781d60d5ca9a24c2..16b76e5ecc9f3fb35604e357ee737398c8aca229 100644
--- a/app/views/resources/room_planning/booking_plan.php
+++ b/app/views/resources/room_planning/booking_plan.php
@@ -46,10 +46,10 @@
         _('Belegungsplan'),
         [
             'editable' => true,
-            'selectable' => ($fullcalendar_studip_urls['add'] != null),
+            'selectable' => !empty($fullcalendar_studip_urls['add']),
             'studip_urls' => $fullcalendar_studip_urls,
-            'minTime' => ($min_time),
-            'maxTime' => ($max_time),
+            'minTime' => $min_time,
+            'maxTime' => $max_time,
             'allDaySlot' => false,
             'header' => [
                 'left' => 'dayGridMonth,timeGridWeek,timeGridDay',