From 045c15acb124c1892e8ccf19529cab16875a2106 Mon Sep 17 00:00:00 2001
From: Aaron Robertshaw <60436221+aaronrobertshaw@users.noreply.github.com>
Date: Thu, 13 Jun 2024 16:28:11 +1000
Subject: [PATCH] Global Styles: Skip registration of variation styles when
 unsupported

---
 lib/block-supports/block-style-variations.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/block-supports/block-style-variations.php b/lib/block-supports/block-style-variations.php
index e078b50b19d5a3..6bb55e20beac9d 100644
--- a/lib/block-supports/block-style-variations.php
+++ b/lib/block-supports/block-style-variations.php
@@ -486,6 +486,13 @@ function gutenberg_register_block_style_variations_from_theme_json_data( $variat
  * @access private
  */
 function gutenberg_register_block_style_variations_from_theme() {
+	$has_partials_directory = is_dir( get_stylesheet_directory() . '/styles' ) || is_dir( get_template_directory() . '/styles' );
+
+	// Skip any registration of styles if no theme.json or variation partials.
+	if ( ! wp_theme_has_theme_json() && ! $has_partials_directory ) {
+		return;
+	}
+
 	// Partials from `/styles`.
 	$variations_partials = WP_Theme_JSON_Resolver_Gutenberg::get_style_variations( 'block' );
 	gutenberg_register_block_style_variations_from_theme_json_data( $variations_partials );