diff --git a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Auth/Combination.pm b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Auth/Combination.pm
index 5b6448d94..3e0db2e5a 100644
--- a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Auth/Combination.pm
+++ b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Auth/Combination.pm
@@ -139,6 +139,8 @@ sub getDisplayType {
 sub authLogout {
     my ( $self, $req ) = @_;
     $self->getStack( $req, 'extractFormInfo' ) or return PE_ERROR;
+    # Avoid warning msg at first access
+    $req->userData->{_combinationTry} ||= '';
     my ( $res, $name ) =
       $req->data->{combinationStack}->[ $req->userData->{_combinationTry} ]
       ->[0]->( 'authLogout', $req );