PHP-Error

2024/04/03 15:09:39 [error] 497856#497856: *7144532 FastCGI sent in stderr: "PHP message: TypeError: Argument 2 passed to Deputy::isDeputy() must be of the type string, null given, called in lib/phplib/Seminar_Perm.class.php on line 192 and defined in lib/models/Deputy.php:151
Stack trace:
#0 lib/phplib/Seminar_Perm.class.php(192): Deputy::isDeputy()
#1 lib/phplib/Seminar_Perm.class.php(124): Seminar_Perm->get_uncached_studip_perm()
#2 lib/phplib/Seminar_Perm.class.php(219): Seminar_Perm->get_studip_perm()
#3 public/plugins_packages/Vec/ProvisionallyAccepted/ProvisionallyAccepted.class.php(13): Seminar_Perm->have_studip_perm()