Server Crashing instand can you try to fix it?

[note3crafter]

PocketMine-MP Crash Dump Wed Jun 26 17:47:15 CEST 2019

Error: Call to a member function getFolderName() on null
File: plugins/1vs1.phar/src/vixikhd/onevsone/arena/ArenaScheduler
Line: 156
Type: Error

THIS CRASH WAS CAUSED BY A PLUGIN
BAD PLUGIN: 1vs1 v1.0.1

Code:

Backtrace:
#0 plugins/1vs1.phar/src/vixikhd/onevsone/arena/ArenaScheduler(65): vixikhd\onevsone\arena\ArenaScheduler->reloadSign()
#1 src/pocketmine/scheduler/TaskHandler(159): vixikhd\onevsone\arena\ArenaScheduler->onRun(integer 1)
#2 src/pocketmine/scheduler/TaskScheduler(199): pocketmine\scheduler\TaskHandler->run(integer 1)
#3 src/pocketmine/plugin/PluginManager(688): pocketmine\scheduler\TaskScheduler->mainThreadHeartbeat(integer 1)
#4 src/pocketmine/Server(2560): pocketmine\plugin\PluginManager->tickSchedulers(integer 1)
#5 src/pocketmine/Server(2336): pocketmine\Server->tick()
#6 src/pocketmine/Server(2196): pocketmine\Server->tickProcessor()
#7 src/pocketmine/Server(1775): pocketmine\Server->start()
#8 src/pocketmine/PocketMine(266): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /home/minecraft/, string /home/minecraft/plugins/)
#9 (1): require(string phar:///home/minecraft/pocketmine.phar/src/pocketmine/PocketMine.php)

PocketMine-MP version: 3.8.3 [Protocol 354]
Git commit: 63e58677278e7d5a78f2f1f52add37110e02be87
uname -a: Linux 1e729ea676ea 4.19.0-0.bpo.5-amd64 #1 SMP Debian 4.19.37-3~bpo9+1 (2019-05-18) x86_64
PHP Version: 7.2.16
Zend version: 3.2.0
OS : Linux, linux

[GamakCZ]

Thx for report