diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 76a143d261..8a254eecdb 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -314,6 +314,9 @@ final class WP_Customize_Manager {
 	 * @return WP_Theme
 	 */
 	public function theme() {
+		if ( ! $this->theme ) {
+			$this->theme = wp_get_theme();
+		}
 		return $this->theme;
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 44edfb67c6..2319482c1f 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31535';
+$wp_version = '4.2-alpha-31536';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.