diff -r 30abc8024afe -r 509510586665 www/prod_checklist.php
--- a/www/prod_checklist.php	Fri Jun 18 15:26:55 2021 +0200
+++ b/www/prod_checklist.php	Fri Jun 18 21:26:28 2021 +0200
@@ -128,7 +128,7 @@
 			$this->Checkline(sprintf("%.1f",floatval($row['w1_amount'] * $factor)).' liter water '.$row['w1_name']);
 			$mashwater += floatval($row['w1_amount'] * $factor);
 		}
-		if ($row['w2_name']) {
+		if ($row['w2_name'] && floatval($row['w2_amount'])) {
 			$this->Checkline(sprintf("%.1f",floatval($row['w2_amount'] * $factor)).' liter water '.$row['w2_name']);
 			$mashwater += floatval($row['w2_amount'] * $factor);
 		}