diff -r 2cbf21bb9bdc -r f962f1e5936e www/includes/db_product.php
--- a/www/includes/db_product.php	Sun Mar 01 12:48:09 2020 +0100
+++ b/www/includes/db_product.php	Mon Mar 02 17:15:38 2020 +0100
@@ -265,7 +265,11 @@
 		$sql .= "', prop4_type='" . $_POST['prop4_type'];
 		$sql .= "', prop4_volume='" . $_POST['prop4_volume'];
 	}
-	$sql .= "', divide_type='" . $_POST['divide_type'];
+	if ($_POST['yeast_prod_date'] == '')
+                $sql .= "', yeast_prod_date=NULL";
+        else
+                $sql .= "', yeast_prod_date='" . $_POST['yeast_prod_date'] . "'";
+	$sql .=  ", divide_type='" . $_POST['divide_type'];
 	$sql .= "', divide_size='" . floatval($_POST['divide_size']);
 	$sql .= "', divide_factor='" . floatval($_POST['divide_factor']);
 	$sql .= "', divide_parts='" . $_POST['divide_parts'];
@@ -869,7 +873,8 @@
 		$brew .= ',"starter_type":' . $row['starter_type'];
 		$brew .= ',"starter_sg":' . $row['starter_sg'];
 		$brew .= ',"starter_viability":' . $row['starter_viability'];
-		$brew .= ',"prop1_type":' . $row['prop1_type'];
+		$brew .= ',"yeast_prod_date":"' . $row['yeast_prod_date'];
+		$brew .= '","prop1_type":' . $row['prop1_type'];
 		$brew .= ',"prop1_volume":' . $row['prop1_volume'];
 		$brew .= ',"prop2_type":' . $row['prop2_type'];
 		$brew .= ',"prop2_volume":' . $row['prop2_volume'];