[01:35:41 ERROR]: Could not pass event PlayerInteractEvent to HeadsPlus v2.1.4
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:234) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.PlayerInteractManager.a(PlayerInteractManager.java:458) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:945) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:37) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:1) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_144]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_144]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NullPointerException
        at io.github.thatsmusic99.headsplus.events.HeadInteractEvent.interact(HeadInteractEvent.java:31) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor172.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_144]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_144]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot-1.12.1.jar:git-Spigot-65e8124-79e55b6]
        ... 17 more