14:23:33 [SEVERE] Could not pass event PlayerInteractEvent to Factions
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:324)
        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.interact(ItemInWorldManager.java:330)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:650)
        at net.minecraft.server.Packet15Place.handle(SourceFile:58)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
        at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
        at net.minecraft.server.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
        at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
        at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NullPointerException
        at com.massivecraft.factions.Faction.playerHasOwnershipRights(Faction.java:672)
        at com.massivecraft.factions.listeners.FactionsPlayerListener.canPlayerUseBlock(FactionsPlayerListener.java:401)
        at com.massivecraft.factions.listeners.FactionsPlayerListener.onPlayerInteract(FactionsPlayerListener.java:226)
        at sun.reflect.GeneratedMethodAccessor56.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:322)
        ... 16 more