Index: /mods/wpsg_mod_deliverytime.class.php
===================================================================
--- /mods/wpsg_mod_deliverytime.class.php	(revision 7733)
+++ /mods/wpsg_mod_deliverytime.class.php	(revision 7734)
@@ -194,5 +194,6 @@
 
 			$produkt_data['wpsg_mod_deliverytime_holiday'] = wpsg_q(wpsg_sinput(WPSG_SANITIZE_VALUES, ['0, 1, 2'], wpsg_getStr($_REQUEST['wpsg_mod_deliverytime']['wpsg_mod_deliverytime_holiday'])));
-            wpsg_checkRequest(
+
+			if (isset($_REQUEST['wpsg_mod_deliverytime_holiday'])) wpsg_checkRequest(
                 'wpsg_mod_deliverytime_holiday',
                 [WPSG_SANITIZE_VALUES, ['0', '1']],