Warning: Undefined variable $hiddenDirs in /webapps/luft/fx.php on line 423

Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /webapps/luft/fx.php:423
Stack trace:
#0 /webapps/luft/fx.php(423): in_array()
#1 /webapps/luft/photoindex.php(3): getFullMapList()
#2 {main}
  thrown in /webapps/luft/fx.php on line 423