error when removing product from the cart

When you check your order was found: when press the button delete a product from the basket. out error 500 - PASSWORD DO NOT MATCH.

At the second attempt everything is in order. But there was another problem - when you click the checkout is automatic selection of payment method Moneybookers, even though I have included two plug-ins HikaShop collect on delivery payment plugin and HikaShop Moneybookers payment plugin.

I get the error described in this thread, "500 - Passwords do not match. Please re-enter password."

I see this when i:

am not logged in,
add multiple items to the cart,
go to the registration page,
try to remove an item from the cart displayed below the login area.

The remove item link takes you to the error page.

I noticed that the browser automatically enters username and password, when this is not entered there will not be an error.
(I do not submit the password to get the error, I only try to remove an item from the cart)

The code
if($user->guest && empty($user_id)){

appears twice, in that document, at line 393 and line 1226

Changing both seems to solve it.
Thank you

(side note, I am unable to upload .zip files to your forum)

Thanks for the tip. You have very good technical support.