diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index fc0356aedf..a166ab017a 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -1550,7 +1550,7 @@ function wp_notify_moderator($comment_id) {
 	$user = get_userdata( $post->post_author );
 	// Send to the administration and to the post author if the author can modify the comment.
 	$emails = array( get_option( 'admin_email' ) );
-	if ( user_can( $user->ID, 'edit_comment', $comment_id ) && ! empty( $user->user_email ) ) {
+	if ( $user && user_can( $user->ID, 'edit_comment', $comment_id ) && ! empty( $user->user_email ) ) {
 		if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) )
 			$emails[] = $user->user_email;
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5b6b5ebda1..6277a17e76 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32691';
+$wp_version = '4.3-alpha-32692';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.