PHP Fatal error after upgrade

Hello!

I’m runnig 3.7.0 version on PHP 8.4 & WP: 6.9 …and get this error:

[26-Dec-2025 03:05:17 UTC] PHP Fatal error:  Uncaught Error: Call to a member function createMailEngine() on null in /home/host439282/domains/my-domain.com/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMail.php:202
Stack trace:
#0 /home/host439282/domains/my-domain.com/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMail.php(60): PostmanWpMail->sendMessage()
#1 /home/host439282/domains/my-domain.com/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php(149): PostmanWpMail->send()
#2 /home/host439282/domains/my-domain.com/public_html/wp-includes/class-wp-recovery-mode-email-service.php(225): wp_mail()
#3 /home/host439282/domains/my-domain.com/public_html/wp-includes/class-wp-recovery-mode-email-service.php(62): WP_Recovery_Mode_Email_Service->send_recovery_mode_email()
#4 /home/host439282/domains/my-domain.com/public_html/wp-includes/class-wp-recovery-mode.php(185): WP_Recovery_Mode_Email_Service->maybe_send_recovery_mode_email()
#5 /home/host439282/domains/my-domain.com/public_html/wp-includes/class-wp-fatal-error-handler.php(55): WP_Recovery_Mode->handle_error()
#6 [internal function]: WP_Fatal_Error_Handler->handle()
#7 {main}
  thrown in /home/host439282/domains/my-domain.com/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMail.php on line 202

Can you help?

Greg