payer auth verifier causes session timeout error

[DigitalShadow]

[02-Sep-2020 13:45:50 Europe/London] Request URI: /index.php?main_page=payer_auth_verifier, IP address:
#1 session_id() called at [/home/site/public_html/includes/modules/pages/payer_auth_verifier/header_php.php:55]
#2 require(/home/site/public_html/includes/modules/pages/payer_auth_verifier/header_php.php) called at [/home/site/public_html/index.php:36]
--> PHP Warning: session_id(): Cannot change session id when session is active in /home/site/public_html/includes/modules/pages/payer_auth_verifier/header_php.php on line 55.

1.5.6c PHP Version: 7.3.21

I've verified the bug myself and also verified that the bug doesn't happen 100% of the time.

When clicking the final stage to confirm, the verifier page fails with a session timeout error.

When attempting payment via paypaldp I get the error.

[DigitalShadow]

// Get the MD back and set it as the session id

  if (isset($_REQUEST["MD"]) && $_REQUEST["MD"] != null && strlen($_REQUEST["MD"]) != 0) {

    session_id($_REQUEST["MD"]);

  }

[DigitalShadow]

when watching in "whos online" you can see that the customer session dies and they become a guest on that page.

[DigitalShadow]

Can I also mention that the firing of this warning does not result in a failure.

I can see that the warning is being given for successful sales, but i can also confirm that there is an issue somewhere.

After clicking the final confirm button, the stage where the card check takes place, during this check, a session timeout error is shown, not sure of cause.

[kalm]

I have the similar issue. Time out after payment, customer session becomes a guest session.
https://www.zen-cart.com/showthread....eckout_success

[DigitalShadow]

Your problem is different, this problem causes the transaction to fail before completion.