Index: /mods/wpsg_mod_fuellmenge.class.php
===================================================================
--- /mods/wpsg_mod_fuellmenge.class.php	(revision 7652)
+++ /mods/wpsg_mod_fuellmenge.class.php	(revision 7653)
@@ -299,5 +299,6 @@
 			$fmenge_reference = $fmenge  / $conversionvalue;
 			
-			$reference_price = $price / $fmenge_reference * $referencevalue;
+			if ($fmenge_reference <= 0) $reference_price = 0;
+			else $reference_price = $price / $fmenge_reference * $referencevalue;
 			
 			return [