From 874bf8ed4433879bf0b4c8e5f5853234021c4da1 Mon Sep 17 00:00:00 2001
From: Francis Appels <francis.appels@yahoo.com>
Date: Tue, 6 Jul 2021 16:39:58 +0200
Subject: [PATCH] backtopageforcancel can be set but empty

---
 htdocs/product/inventory/card.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/htdocs/product/inventory/card.php b/htdocs/product/inventory/card.php
index 754c2b64155..067869ba5ba 100644
--- a/htdocs/product/inventory/card.php
+++ b/htdocs/product/inventory/card.php
@@ -183,7 +183,7 @@ if ($action == 'create') {
 	if ($backtopage) {
 		print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
 	}
-	if (isset($backtopageforcancel)) {
+	if (!empty($backtopageforcancel)) {
 		print '<input type="hidden" name="backtopageforcancel" value="'.$backtopageforcancel.'">';
 	}