diff --git a/lib/compat/wordpress-6.1/class-wp-theme-json-6-1.php b/lib/compat/wordpress-6.1/class-wp-theme-json-6-1.php
index 220ef97d7fcece..57732ca0ecadbd 100644
--- a/lib/compat/wordpress-6.1/class-wp-theme-json-6-1.php
+++ b/lib/compat/wordpress-6.1/class-wp-theme-json-6-1.php
@@ -491,7 +491,7 @@ protected static function get_style_nodes( $theme_json, $selectors = array() ) {
 
 		if ( isset( $theme_json['styles']['elements'] ) ) {
 			foreach ( self::ELEMENTS as $element => $selector ) {
-				if ( ! isset( $theme_json['styles']['elements'][ $element ] ) ) {
+				if ( ! isset( $theme_json['styles']['elements'][ $element ] ) || ! array_key_exists( $element, static::ELEMENTS ) ) {
 					continue;
 				}