Index: /mods/wpsg_mod_fuellmenge.class.php
===================================================================
--- /mods/wpsg_mod_fuellmenge.class.php	(revision 7655)
+++ /mods/wpsg_mod_fuellmenge.class.php	(revision 7657)
@@ -154,7 +154,8 @@
 		} // public function getFuellmenge($produkt_key)
 		
-		public function product_addedit_content(&$product_content, &$product_data)
-		{
-		
+		public function product_addedit_content(&$product_content, &$product_data) {
+		
+			if (!wpsg_isSizedInt($product_data['id'])) return null;
+			
 			if (wpsg_isSizedInt($product_data['id']))
 			{
@@ -173,5 +174,4 @@
 			$product_data['arFeinheiten'] = explode(',', $this->shop->get_option('wpsg_mod_fuellmenge_einheit'));
 		
-			
 			if ($this->shop->hasMod('wpsg_mod_stock'))
 			{