diff --git a/htdocs/compta/facture/class/api_invoices.class.php b/htdocs/compta/facture/class/api_invoices.class.php
index d48740ea68d62..9a9320e489766 100644
--- a/htdocs/compta/facture/class/api_invoices.class.php
+++ b/htdocs/compta/facture/class/api_invoices.class.php
@@ -632,8 +632,10 @@ public function put($id, $request_data = null)
 			}
 		}
 
-		if ($this->invoice->update(DolibarrApiAccess::$user)) {
+		if ($this->invoice->update(DolibarrApiAccess::$user) > 0) {
 			return $this->get($id);
+		} else {
+			throw new RestException(500, $this->invoice->error);
 		}
 
 		return false;