diff --git a/wp-admin/includes/ajax-actions.php b/wp-admin/includes/ajax-actions.php
index a5df77dca3..cf1e92b036 100644
--- a/wp-admin/includes/ajax-actions.php
+++ b/wp-admin/includes/ajax-actions.php
@@ -2821,7 +2821,7 @@ function wp_ajax_query_themes() {
 		'fields'   => $theme_field_defaults
 	) );
 
-	if ( 'favorites' === $args['browse'] && ! isset( $args['user'] ) ) {
+	if ( isset( $args['browse'] ) && 'favorites' === $args['browse'] && ! isset( $args['user'] ) ) {
 		$user = get_user_option( 'wporg_favorites' );
 		if ( $user ) {
 			$args['user'] = $user;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a6dfaafad0..73008fe997 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-beta4-35645';
+$wp_version = '4.4-beta4-35646';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.