From a9a95a9b06b12b65e8f8bee2f9226f864aa00244 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Demarle?= <frederic.demarle@yahoo.fr>
Date: Fri, 10 Oct 2025 15:41:39 +0200
Subject: [PATCH] `clean_taxonomy_cache()` Regenerate hierarchy only when
 needed

---
 src/wp-includes/taxonomy.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/wp-includes/taxonomy.php b/src/wp-includes/taxonomy.php
index 11c3221be51a8..69f3fe7484c24 100644
--- a/src/wp-includes/taxonomy.php
+++ b/src/wp-includes/taxonomy.php
@@ -3732,8 +3732,10 @@ function clean_taxonomy_cache( $taxonomy ) {
 	wp_cache_set_terms_last_changed();
 
 	// Regenerate cached hierarchy.
-	delete_option( "{$taxonomy}_children" );
-	_get_term_hierarchy( $taxonomy );
+	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
+		delete_option( "{$taxonomy}_children" );
+		_get_term_hierarchy( $taxonomy );
+	}
 
 	/**
 	 * Fires after a taxonomy's caches have been cleaned.