Warning: Undefined variable $c in /var/www/bttb.jp/kabuu/dx.php on line 419

Fatal error: Uncaught TypeError: implode(): If argument #1 ($separator) is of type string, argument #2 ($array) must be of type array, null given in /var/www/bttb.jp/kabuu/dx.php:419 Stack trace: #0 {main} thrown in /var/www/bttb.jp/kabuu/dx.php on line 419