FoundBiome Error

[03:02:03 ERROR]: Could not pass event PlayerJoinEvent to FoundBiome v1.1
org.bukkit.event.EventException: null
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.12.2.jar:git-Paper-1431]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.12.2.jar:git-Paper-1431]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.12.2.jar:git-Paper-1431]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:515) [patched_1.12.2.jar:git-Paper-1431]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:500) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.PlayerList.onPlayerJoin(PlayerList.java:370) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.PlayerList.a(PlayerList.java:183) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.LoginListener.b(LoginListener.java:178) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.LoginListener.e(LoginListener.java:68) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.NetworkManager.a(NetworkManager.java:255) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.ServerConnection.c(ServerConnection.java:150) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:941) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:427) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) [patched_1.12.2.jar:git-Paper-1431]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [patched_1.12.2.jar:git-Paper-1431]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
Caused by: java.lang.NullPointerException
        at net.alureon.foundbiome.handler.MapHandler.addToMap(MapHandler.java:37) ~[?:?]
        at net.alureon.foundbiome.listener.PlayerJoinListener.onPlayerJoin(PlayerJoinListener.java:23) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor123.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.12.2.jar:git-Paper-1431]
        ... 15 more