diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 8c56097333..fed6568af3 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -24,7 +24,13 @@
 function get_comment_author( $comment_id = 0 ) {
 	$comment = get_comment( $comment_id );
 
-	$comment_id = ! empty( $comment->comment_ID ) ? $comment->comment_ID : (string) $comment_id;
+	if ( ! empty( $comment->comment_ID ) ) {
+		$comment_id = $comment->comment_ID;
+	} elseif ( is_scalar( $comment_id ) ) {
+		$comment_id = (string) $comment_id;
+	} else {
+		$comment_id = '';
+	}
 
 	if ( empty( $comment->comment_author ) ) {
 		$user = ! empty( $comment->user_id ) ? get_userdata( $comment->user_id ) : false;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 215963486b..bf7657f5ba 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6.1-alpha-58761';
+$wp_version = '6.6.1-alpha-58762';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.