diff --git a/htdocs/adherents/card.php b/htdocs/adherents/card.php
index 0fbee667522..f0d8df454cf 100644
--- a/htdocs/adherents/card.php
+++ b/htdocs/adherents/card.php
@@ -646,7 +646,7 @@ if (empty($reshook))
 
 				if (empty($labeltouse) || (int) $labeltouse === -1) {
 					//fallback on the old configuration.
-					setEventMessages('WarningMandatorySetupNotComplete', [], 'errors');
+					setEventMessages('WarningMandatorySetupNotComplete', null, 'errors');
 					$error++;
 				}
 				else {