Stripe Connect : Unknown error

-- HikaShop version -- : 4.5.1
-- Joomla version -- : 3.8.6
-- PHP version -- : 5.6.40
-- Browser(s) name and version -- : Chrome à jour
-- Error-message(debug-mod must be tuned on) -- : PHP Warning:  Cannot modify header information - headers already sent by (output started at xxx/plugins/hikashoppayment/stripeconnect/stripeconnect.php:648) in xxx/libraries/src/Input/Cookie.php on line 100
PHP Warning:  Cannot modify header information - headers already sent by (output started at xxx/plugins/hikashoppayment/stripeconnect/stripeconnect.php:648) in xxx/libraries/joomla/session/handler/joomla.php on line 110

Hello,

We have an issue with the Stripe payment : for a 3D Secure payment, after the customer has validated the payment and then is sent back to our site, the confirmation page is not displayed.
It stays on the payment page with the waiting icon turning, and a "unknown error" message finally appears. (see attachment, with a stripe test card number).

In our log, here are the two errors we have :
[19-May-2022 16:27:57 Europe/Paris] PHP Warning:  Cannot modify header information - headers already sent by (output started at xxx/plugins/hikashoppayment/stripeconnect/stripeconnect.php:648) in xxx/libraries/src/Input/Cookie.php on line 100
[19-May-2022 16:27:57 Europe/Paris] PHP Warning:  Cannot modify header information - headers already sent by (output started at xxx/plugins/hikashoppayment/stripeconnect/stripeconnect.php:648) in xxx/libraries/joomla/session/handler/joomla.php on line 110

Everything is up-to-date, hikashop, hikamarket and the Stripe plugin.

Thanks for your help.

Hello Jerome,

The payment log file has no new record, whereas the debug mode is enabled in the stripe connect plugin (and in joomla config too).

Thanks for your help

Marina

Thanks Jerôme, message sent !