diff --git a/src/Model/Tag.php b/src/Model/Tag.php
index bbe516e49..41c6de111 100644
--- a/src/Model/Tag.php
+++ b/src/Model/Tag.php
@@ -333,6 +333,10 @@ class Tag
 	 */
 	public static function createImplicitMentions(int $uri_id, int $parent_uri_id)
 	{
+		if ($uri_id == $parent_uri_id) {
+			return;
+		}
+
 		// Always mention the direct parent author
 		$parent = Item::selectFirst(['author-link', 'author-name'], ['uri-id' => $parent_uri_id]);
 		self::store($uri_id, self::IMPLICIT_MENTION, $parent['author-name'], $parent['author-link']);