Fatal error: Uncaught TypeError: htmlspecialchars(): Argument #1 ($string) must be of type string, array given in /customers/9/0/9/pindown.eu/httpd.www/kalender/common/toolbox.php:584
Stack trace:
#0 /customers/9/0/9/pindown.eu/httpd.www/kalender/common/toolbox.php(584): htmlspecialchars(Array, 3, 'UTF-8')
#1 /customers/9/0/9/pindown.eu/httpd.www/kalender/index.php(103): validGetVars()
#2 {main}
  thrown in /customers/9/0/9/pindown.eu/httpd.www/kalender/common/toolbox.php on line 584