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Fatal error: Uncaught TypeError: mail(): Argument #1 ($to) must be of type string, null given in /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/functions_mail.php:33 Stack trace: #0 /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/functions_mail.php(33): mail() #1 /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/functions_mail.php(63): sendEmail() #2 /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/functions.php(250): send_notification_add() #3 /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/functions.php(287): reminder_notReleased() #4 /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/index.php(43): scheduleReminder() #5 {main} thrown in /srv/www/htdocs/kub.berlin/www.kub-berlin.org/sprach-tandem/functions_mail.php on line 33