switch ( $restriction->getType() ) {
case 'page':
$value = [ 'id' => $restriction->getValue() ];
- self::addTitleInfo( $value, $restriction->getTitle() );
+ if ( $restriction->getTitle() ) {
+ self::addTitleInfo( $value, $restriction->getTitle() );
+ }
break;
default:
$value = $restriction->getValue();