Fatal error: Uncaught TypeError: mysqli_close(): Argument #1 ($mysql) must be of type mysqli, null given in /mnt/nas/gosicenter.co.kr/html/mobile/bottom.html:110
Stack trace:
#0 /mnt/nas/gosicenter.co.kr/html/mobile/bottom.html(110): mysqli_close()
#1 /mnt/nas/gosicenter.co.kr/html/mobile/new_teacher.html(93): include('...')
#2 {main}
thrown in /mnt/nas/gosicenter.co.kr/html/mobile/bottom.html on line 110
