KOTH join error.

[Coot302]

The command /koth join (arena) doesn't work.

Error: Undefined array key 1
File: plugins/koth-development-1.phar/src/Arena
Line: 346
Type: ErrorException
Backtrace:
#0 plugins/koth-development-1.phar/src/Arena(346): pocketmine\errorhandler\ErrorToExceptionHandler::handle(int 2, string[21] Undefined array key 1, string[68] phar:///home/container/plugins/koth-development-1.phar/src/Arena.php, int 346)
#1 plugins/koth-development-1.phar/src/Arena(316): JaxkDev\KOTH\Arena->getSpawn()
#2 plugins/koth-development-1.phar/src/Arena(613): JaxkDev\KOTH\Arena->spawnPlayer(object pocketmine\player\Player#110150)
#3 plugins/koth-development-1.phar/src/CommandHandler(154): JaxkDev\KOTH\Arena->addPlayer(object pocketmine\player\Player#110150)
#4 plugins/koth-development-1.phar/src/Main(146): JaxkDev\KOTH\CommandHandler->handleCommand(object pocketmine\player\Player#110150, array[2])
#5 pmsrc/src/command/PluginCommand(50): JaxkDev\KOTH\Main->onCommand(object pocketmine\player\Player#110150, object pocketmine\command\PluginCommand#26195, string[4] koth, array[2])
#6 pmsrc/src/command/SimpleCommandMap(205): pocketmine\command\PluginCommand->execute(object pocketmine\player\Player#110150, string[4] koth, array[2])
#7 pmsrc/src/Server(1446): pocketmine\command\SimpleCommandMap->dispatch(object pocketmine\player\Player#110150, string[15] koth join arena)
#8 pmsrc/src/player/Player(1410): pocketmine\Server->dispatchCommand(object pocketmine\player\Player#110150, string[15] koth join arena)
#9 pmsrc/src/network/mcpe/handler/InGamePacketHandler(737): pocketmine\player\Player->chat(string[16] /koth join arena)