[15:00:36 ERROR]: Could not pass event PlayerQuitEvent to BuildBattlePro v4.1.2
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) [spigot.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [spigot.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [spigot.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerList.disconnect(PlayerList.java:399) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1102) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.NetworkManager.handleDisconnection(NetworkManager.java:321) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.ServerConnection.c(ServerConnection.java:174) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:845) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot.jar:git-Spigot-3d850ec-809c399]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_161]
Caused by: java.lang.NullPointerException
        at me.drawe.buildbattle.objects.bbobjects.BBArena.stopArena(BBArena.java:508) [?:?]
        at me.drawe.buildbattle.objects.bbobjects.BBArena.leaveCommands(BBArena.java:162) [?:?]
        at me.drawe.buildbattle.objects.bbobjects.BBArena.removePlayer(BBArena.java:211) [?:?]
        at me.drawe.buildbattle.listeners.PlayerListener.onQuit(PlayerListener.java:534) [?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [?:1.8.0_161]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [?:1.8.0_161]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [?:1.8.0_161]
        at java.lang.reflect.Method.invoke(Unknown Source) [?:1.8.0_161]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-3d850ec-809c399]
        ... 12 more