edit

lib/Wechat.php

@@ -416,7 +416,7 @@ class Wechat
 		}
 
 		if (isset($config['param']['shipping_list']) && $config['param']['shipping_list'] == 'shipping_list') {
-			unset($config['param'][$k]);
+			unset($config['param']['shipping_list']);
 		}
 
 		$config['json'] = isset($config['json']) && $config['json'] ? true : false;