Fatal error:  Uncaught TypeError: GusApi\GusApi::getByNip(): Argument #1 ($nip) must be of type string, null given, called in /home/users/proflow/public_html/gus.proflow.pl/index.php on line 38 and defined in /home/users/proflow/public_html/gus.proflow.pl/src/GusApi/GusApi.php:208
Stack trace:
#0 /home/users/proflow/public_html/gus.proflow.pl/index.php(38): GusApi\GusApi->getByNip(NULL)
#1 {main}
  thrown in /home/users/proflow/public_html/gus.proflow.pl/src/GusApi/GusApi.php on line 208