Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 40052)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -904,9 +904,9 @@
 
 		if ( $can_edit_post && $post->post_status != 'trash' ) {
 			$lock_holder = wp_check_post_lock( $post->ID );
+            $lock_holder = get_userdata( $lock_holder );
 
 			if ( $lock_holder ) {
-				$lock_holder = get_userdata( $lock_holder );
 				$locked_avatar = get_avatar( $lock_holder->ID, 18 );
 				$locked_text = esc_html( sprintf( __( '%s is currently editing' ), $lock_holder->display_name ) );
 			} else {