Ticket #26659: 26659-checking-added.patch

wp-includes/pluggable.php

@@ -1023 +1023 @@
         $author  = get_userdata( $post->post_author );
 
         // Who to notify? By default, just the post author, but others can be added.
-        $emails = array( $author->user_email );
+    $emails = array();
+    if ( ! empty( $author ) ) {
+        $emails[] = $author->user_email;
+    }
 
         /**
          * Filter the list of emails to receive a comment notification.
@@ -1061 +1064 @@
         $notify_author = apply_filters( 'comment_notification_notify_author', false, $comment_id );
 
         // The comment was left by the author
-        if ( ! $notify_author && $comment->user_id == $post->post_author ) {
+        if ( ! $notify_author && $comment->user_id == $post->post_author && ! empty( $author ) ) {
                 unset( $emails[ $author->user_email ] );
         }
 
         // The author moderated a comment on their own post
-        if ( ! $notify_author && $post->post_author == get_current_user_id() ) {
+        if ( ! $notify_author && $post->post_author == get_current_user_id() && ! empty( $author ) ) {
                 unset( $emails[ $author->user_email ] );
         }
 
         // The post author is no longer a member of the blog
-        if ( ! $notify_author && ! user_can( $post->post_author, 'read_post', $post->ID ) ) {
+        if ( ! $notify_author && ! user_can( $post->post_author, 'read_post', $post->ID ) && ! empty( $author ) ) {
                 unset( $emails[ $author->user_email ] );
         }