Advanced Timber Error

[16:09:37] [Server thread/ERROR]: Could not pass event BlockBreakEvent to AdvancedTimber v1.5.3
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:529) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:514) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PlayerInteractManager.breakBlock(PlayerInteractManager.java:295) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PlayerInteractManager.a(PlayerInteractManager.java:254) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PlayerInteractManager.a(PlayerInteractManager.java:230) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1185) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PacketPlayInBlockDig.a(SourceFile:40) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PacketPlayInBlockDig.a(SourceFile:10) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.aX(MinecraftServer.java:910) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:903) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeAll(SourceFile:103) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:886) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:820) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.NullPointerException
        at com.gestankbratwurst.asynctimber.util.PlayerTreeSizeManager.checkMaxTreeSize(PlayerTreeSizeManager.java:32) ~[?:?]
        at com.gestankbratwurst.asynctimber.treehandler.TimberingTree.<init>(TimberingTree.java:46) ~[?:?]
        at com.gestankbratwurst.asynctimber.treehandler.TreeHandler.handleBreak(TreeHandler.java:74) ~[?:?]
        at com.gestankbratwurst.asynctimber.listener.TreeBreakListener.onBreakTrigger(TreeBreakListener.java:87) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        ... 20 more