diff --git a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Run.pm b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Run.pm
index 3660ebe34..64be68557 100644
--- a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Run.pm
+++ b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Run.pm
@@ -55,6 +55,20 @@ sub handler {
     }
     my $res = $self->Lemonldap::NG::Common::PSGI::Router::handler($req);
 
+    # Avoid permanent loop 'Portal <-> _url' if pdata cookie is not removed
+    my $url64 = encode_base64( $req->userData->{_url}, '' );
+    if (    $url64
+        and !$req->pdata->{keepPdata}
+        and $req->userData->{_session_id}
+        and ( $req->{env}->{HTTP_COOKIE} =~ /$url64/ ) )
+
+    {
+        $self->logger->debug("Force cleaning pdata");
+        $self->logger->warning("pdata cookie domain must be set")
+          unless ( $self->conf->{pdataDomain} );
+        $req->pdata( {} );
+    }
+
     # Save pdata
     if ( $sp or %{ $req->pdata } ) {
         my %v = (