diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 4dc46ac3df..cf8c8e9f01 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1667,7 +1667,7 @@ function post_preview() {
 	} else {
 		$is_autosave = true;
 
-		if ( 'auto-draft' == $_POST['post_status'] )
+		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] )
 			$_POST['post_status'] = 'draft';
 
 		$saved_post_id = wp_create_post_autosave( $post->ID );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 209cc9e719..8eea70f18d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-beta2-31895';
+$wp_version = '4.2-beta2-31896';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.