Bug Fix: Cannot use object of type Closure as array

includes/API.php

@@ -195,8 +195,22 @@ public function rest_pre_dispatch( $result, $server, $request ) {
 	 * @param WP_REST_Request                                  $request  Request used to generate the response.
 	 */
 	public function rest_request_before_callbacks( $response, $handler, $request ) {
-		$controller = get_class( $handler['callback'][0] );
+		/**
+		 * Here we attempt to determine the controller class from the handler.
+		 *
+		 * Note: the handler can be a closure, in which case we can't determine the controller.
+		 */
+		if ( isset( $handler['callback'] ) && is_array( $handler['callback'] ) && is_object( $handler['callback'][0] ) ) {
+			$controller = get_class( $handler['callback'][0] );
+		} else if ( is_object( $handler['callback'] ) ) {
+			$controller = get_class( $handler['callback'] );
+		} else {
+			return $response;
+		}
 
+		/**
+		 * If the controller is one of the WooCommerce REST API controllers, we can hijack the request
+		 */
 		switch ( $controller ) {
 			case 'WC_REST_Orders_Controller':
 				$this->wc_rest_api_handler = new API\Orders( $request );

includes/Gateways.php

@@ -49,7 +49,7 @@ public function payment_gateways( array $gateways ) {
 	 * - Order and set default order
 	 * - Also going to remove icons from the gateways
 	 *
-	 * - BUG: a user with WooCommerce Blocks is getting null for $gateways?
+	 * - NOTE: lots of plugins/themes call this filter and I can't guarantee that $gateways is an array
 	 *
 	 * @param array | null $gateways
 	 *

readme.txt

@@ -64,7 +64,8 @@ There is more information on our website at [https://wcpos.com](https://wcpos.co
 == Changelog ==
 
 = 1.1.1 - 2023/05/xx =
-* Fix: remove private meta data from Order Preview modal
+* Improvement: remove private meta data from Order Preview modal
+* Bug Fix: 'Cannot use object of type Closure as array' in the API.php file
 
 = 1.1.0 - 2023/05/19 =
 * Fix: disable Lite Speed Cache for POS page