16:36:42 [SEVERE] Could not pass event PlayerInteractEvent to rppCore
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:177)
        at net.minecraft.server.ItemInWorldManager.dig(ItemInWorldManager.java:114)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:554)
        at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:133)
        at net.minecraft.server.Packet14BlockDig.handle(SourceFile:46)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:276)
        at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:111)
        at org.getspout.spout.SpoutNetServerHandler.d(SpoutNetServerHandler.java:173)
        at net.minecraft.server.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:580)
        at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:213)
        at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:407)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NullPointerException
        at com.rpp.core.material.CustomManager.isItem(CustomManager.java:466)
        at com.rpp.core.event.vanilla.VanillaHomeListener.onPlayerInteract(VanillaHomeListener.java:66)
        at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:339)
        ... 18 more