[Server thread/CRITICAL]: TypeError: "Argument 1 passed to pocketmine\Server::isLevelGener
ted() must be of the type string, null given, called in /root/PocketMine-MP/plugins/Murder/src/Murder
ystery/MurderMystery.php on line 41" (EXCEPTION) in "src/pocketmine/Server" at line 1128
[13:42:47] [Server thread/DEBUG]: #0 plugins/Murder/src/MurderMystery/MurderMystery(41): pocketmine\S
rver->isLevelGenerated(NULL )
[13:42:47] [Server thread/DEBUG]: #1 src/pocketmine/plugin/PluginBase(90): MurderMystery\MurderMyster
->onEnable()
[13:42:47] [Server thread/DEBUG]: #2 plugins/DevTools_v1.12.7.phar/src/FolderPluginLoader/FolderPlugi
Loader(125): pocketmine\plugin\PluginBase->setEnabled(boolean 1)
[13:42:47] [Server thread/DEBUG]: #3 src/pocketmine/plugin/PluginManager(610): FolderPluginLoader\Fol
erPluginLoader->enablePlugin(MurderMystery\MurderMystery object)
[13:42:47] [Server thread/DEBUG]: #4 src/pocketmine/Server(1952): pocketmine\plugin\PluginManager->en
blePlugin(MurderMystery\MurderMystery object)
[13:42:47] [Server thread/DEBUG]: #5 src/pocketmine/Server(1938): pocketmine\Server->enablePlugin(Mur
erMystery\MurderMystery object)
[13:42:47] [Server thread/DEBUG]: #6 src/pocketmine/Server(1732): pocketmine\Server->enablePlugins(in
eger 1)
[13:42:47] [Server thread/DEBUG]: #7 src/pocketmine/PocketMine(564): pocketmine\Server->__construct(B
seClassLoader object, pocketmine\utils\MainLogger object, string /root/PocketMine-MP/, string /root/P
cketMine-MP/, string /root/PocketMine-MP/plugins/)