diff --git a/inc/meta-box.php b/inc/meta-box.php
index 12a9c482..3e3a9ad4 100644
--- a/inc/meta-box.php
+++ b/inc/meta-box.php
@@ -104,7 +104,7 @@ protected function object_hooks() {
 				add_action( 'edit_attachment', [ $this, 'save_post' ] );
 				add_action( 'add_attachment', [ $this, 'save_post' ] );
 			} else {
-				add_action( "save_post_{$post_type}", [ $this, 'save_post' ] );
+				add_action( "save_post", [ $this, 'save_post' ] );
 			}
 		}
 	}
diff --git a/js/autosave.js b/js/autosave.js
index 55af32f2..14ceac07 100644
--- a/js/autosave.js
+++ b/js/autosave.js
@@ -2,7 +2,7 @@
 	'use strict';
 
 	$( document ).ajaxSend( function ( event, xhr, settings ) {
-		if ( ! Array.isArray( settings.data ) || -1 === settings.data.indexOf( 'wp_autosave' ) ) {
+		if ( ( typeof settings.data !== 'string' ) || -1 === settings.data.indexOf( 'wp_autosave' ) ) {
 			return;
 		}
 		var inputSelectors = 'input[class*="rwmb"], textarea[class*="rwmb"], select[class*="rwmb"], button[class*="rwmb"], input[name^="nonce_"]';