diff --git a/core/usbh_core.c b/core/usbh_core.c
index 211636de..79c6cf95 100644
--- a/core/usbh_core.c
+++ b/core/usbh_core.c
@@ -546,15 +546,15 @@ int usbh_enumerate(struct usbh_hubport *hport)
         struct usbh_class_driver *class_driver = (struct usbh_class_driver *)usbh_find_class_driver(intf_desc->bInterfaceClass, intf_desc->bInterfaceSubClass, intf_desc->bInterfaceProtocol, hport->device_desc.idVendor, hport->device_desc.idProduct);
 
         if (class_driver == NULL) {
-            USB_LOG_ERR("do not support Class:0x%02x,Subclass:0x%02x,Protocl:0x%02x\r\n",
+            USB_LOG_ERR("Do not support Class:0x%02x, Subclass:0x%02x, Protocl:0x%02x on interface %u\r\n",
                         intf_desc->bInterfaceClass,
                         intf_desc->bInterfaceSubClass,
-                        intf_desc->bInterfaceProtocol);
-
+                        intf_desc->bInterfaceProtocol,
+                        i);
             continue;
         }
         hport->config.intf[i].class_driver = class_driver;
-        USB_LOG_INFO("Loading %s class driver\r\n", class_driver->driver_name);
+        USB_LOG_INFO("Loading %s class driver on interface %u\r\n", class_driver->driver_name, i);
         ret = CLASS_CONNECT(hport, i);
     }
 
@@ -570,6 +570,7 @@ void usbh_hubport_release(struct usbh_hubport *hport)
 {
     if (hport->connected) {
         hport->connected = false;
+        usbh_kill_urb(&hport->ep0_urb);
         usbh_free_devaddr(hport);
         for (uint8_t i = 0; i < hport->config.config_desc.bNumInterfaces; i++) {
             if (hport->config.intf[i].class_driver && hport->config.intf[i].class_driver->disconnect) {
@@ -577,7 +578,6 @@ void usbh_hubport_release(struct usbh_hubport *hport)
             }
         }
         hport->config.config_desc.bNumInterfaces = 0;
-        usbh_kill_urb(&hport->ep0_urb);
         if (hport->mutex) {
             usb_osal_mutex_delete(hport->mutex);
         }