diff --git a/htdocs/fourn/commande/list.php b/htdocs/fourn/commande/list.php
index 5a80dc98f81..67d75d456b1 100644
--- a/htdocs/fourn/commande/list.php
+++ b/htdocs/fourn/commande/list.php
@@ -511,7 +511,7 @@ if (empty($reshook)) {
 							}
 
 							$tva_tx = $lines[$i]->tva_tx;
-							if (!empty($lines[$i]->vat_src_code) && !preg_match('/\(/', $tva_tx)) {
+							if (!empty($lines[$i]->vat_src_code) && !preg_match('/\(/', (string) $tva_tx)) {
 								$tva_tx .= ' ('.$lines[$i]->vat_src_code.')';
 							}
 
diff --git a/htdocs/fourn/facture/card.php b/htdocs/fourn/facture/card.php
index 609270a284a..ed924373e5e 100644
--- a/htdocs/fourn/facture/card.php
+++ b/htdocs/fourn/facture/card.php
@@ -1339,7 +1339,7 @@ if (empty($reshook)) {
 								}
 
 								$tva_tx = $lines[$i]->tva_tx;
-								if (!empty($lines[$i]->vat_src_code) && !preg_match('/\(/', $tva_tx)) {
+								if (!empty($lines[$i]->vat_src_code) && !preg_match('/\(/', (string) $tva_tx)) {
 									$tva_tx .= ' ('.$lines[$i]->vat_src_code.')';
 								}