diff --git a/wp-includes/admin-bar.php b/wp-includes/admin-bar.php
index cbb2fd32fb..412d42f571 100644
--- a/wp-includes/admin-bar.php
+++ b/wp-includes/admin-bar.php
@@ -1136,7 +1136,7 @@ function is_admin_bar_showing() {
 	global $show_admin_bar, $pagenow;
 
 	// For all these types of requests, we never want an admin bar.
-	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'DOING_AJAX' ) || defined( 'IFRAME_REQUEST' ) ) {
+	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'DOING_AJAX' ) || defined( 'IFRAME_REQUEST' ) || wp_is_json_request() ) {
 		return false;
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ec16d1f816..02ce327bbf 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta1-44607';
+$wp_version = '5.1-beta1-44608';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.