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 f06ecc93713f8d..8e12d99a074905 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
@@ -1090,7 +1090,7 @@ protected static function compute_style_properties( $styles, $settings = array()
 	 * @param array $styles Styles subtree.
 	 * @param array $path   Which property to process.
 	 * @param array $theme_json Theme JSON array.
-	 * @return string Style property value.
+	 * @return string|array|null Style property value.
 	 */
 	protected static function get_property_value( $styles, $path, $theme_json = null ) {
 		$value = _wp_array_get( $styles, $path );
@@ -1113,7 +1113,7 @@ protected static function get_property_value( $styles, $path, $theme_json = null
 			}
 		}
 
-		if ( is_array( $value ) ) {
+		if ( ! $value || is_array( $value ) ) {
 			return $value;
 		}