diff --git a/htdocs/product/admin/product.php b/htdocs/product/admin/product.php
index a8106a9ae88..069029d074b 100644
--- a/htdocs/product/admin/product.php
+++ b/htdocs/product/admin/product.php
@@ -148,11 +148,15 @@ if ($action == 'other') {
 	$value = GETPOST('activate_FillProductDescAuto', 'alpha');
 	$res = dolibarr_set_const($db, "PRODUIT_AUTOFILL_DESC", $value, 'chaine', 0, '', $conf->entity);
 
-	$value = GETPOST('PRODUIT_FOURN_TEXTS', 'alpha');
-	$res = dolibarr_set_const($db, "PRODUIT_FOURN_TEXTS", $value, 'chaine', 0, '', $conf->entity);
+	if (GETPOSTISSET('PRODUIT_FOURN_TEXTS')) {
+		$value = GETPOST('PRODUIT_FOURN_TEXTS', 'alpha');
+		$res = dolibarr_set_const($db, "PRODUIT_FOURN_TEXTS", $value, 'chaine', 0, '', $conf->entity);
+	}
 
-	$value = GETPOST('PRODUCT_USE_SUPPLIER_PACKAGING', 'alpha');
-	$res = dolibarr_set_const($db, "PRODUCT_USE_SUPPLIER_PACKAGING", $value, 'chaine', 0, '', $conf->entity);
+	if (GETPOSTISSET('PRODUCT_USE_SUPPLIER_PACKAGING')) {
+		$value = GETPOST('PRODUCT_USE_SUPPLIER_PACKAGING', 'alpha');
+		$res = dolibarr_set_const($db, "PRODUCT_USE_SUPPLIER_PACKAGING", $value, 'chaine', 0, '', $conf->entity);
+	}
 }