diff --git a/wp-includes/meta.php b/wp-includes/meta.php
index cd684b6c91..0a8c7bc043 100644
--- a/wp-includes/meta.php
+++ b/wp-includes/meta.php
@@ -1139,7 +1139,7 @@ function unregister_meta_key( $object_type, $meta_key ) {
 function get_registered_meta_keys( $object_type ) {
 	global $wp_meta_keys;
 
-	if ( ! isset( $wp_meta_keys[ $object_type ] ) ) {
+	if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $object_type ] ) ) {
 		return array();
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c86c36435b..ee6914d420 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta3-38107';
+$wp_version = '4.6-beta3-38108';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.