One-Page Checkout [Support Thread]

[TitanOwl]

Hello.
I'm having a weird issue on mobile with this module.
New install ZC1.5.7d and OPC 2.3.11
In trying to checkout as a guest, after entering the contact/billing/shipping info and pressing the SAVE CHANGES button I'm getting a blank page and the following error
in the logs

#1 trigger_error() called at [/includes/classes/OnePageCheckout.php:1310]
#2 OnePageCheckout->validateAndSaveAjaxCustomerInfo() called at [/includes/classes/ajax/zcAjaxOnePageCheckout.php:401]
#3 zcAjaxOnePageCheckout->validateCustomerInfo() called at [/ajax.php:85]
--> PHP Fatal error: validateAndSaveAjaxCustomerInfo, invalid POST: array (
'email_address_conf' => '[email protected]',
'telephone' => '',
) in /includes/classes/OnePageCheckout.php on line 1310.

It's only happening on mobile, but not on desktop.

Any idea what could be causing this?

Thank you!

Zen cart v1.5.7c
PHP Version 7.4.29
Responsive Classic Template

Module : One Page Checkout 2.4.0

The module for guest checkout works great for Desktop, it interacts properly, but when I use a mobile (for example my own cell phone) to do checkout as a guest, it takes the initial information such as email/BD/Name and address and when I click save, it saves information except the BD and stays in the same page without giving any option to be able to confirm and check out.
So basically it does not work on Mobile.
I realized many customers like to check out as a guest and we lose lots of them.

Please help in this matter. thank you.