diff --git a/wp-includes/meta.php b/wp-includes/meta.php
index ff32086..2e0f4e3 100644
--- a/wp-includes/meta.php
+++ b/wp-includes/meta.php
@@ -1133,7 +1133,7 @@ function registered_meta_key_exists( $object_type, $object_subtype, $meta_key )
 
 	// Only specific core object types are supported.
 	if ( ! wp_object_type_exists( $object_type ) ) {
-		return new WP_Error( 'invalid_meta_key', __( 'Invalid meta key. Not a core object type.' ) );
+		return false;
 	}
 
 	if ( ! isset( $wp_meta_keys[ $object_type ] ) ) {