CRAFTBOOK-3162 - Reported by Kainzo

[17:26:47 ERROR]: Could not pass event SelfTriggerPingEvent to CraftBook v3.9-SNAPSHOT
org.bukkit.event.EventException

  at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at com.sk89q.craftbook.core.st.SelfTriggeringManager.registerSelfTrigger(SelfTriggeringManager.java:34) [CraftBook.jar:3.9-SNAPSHOT]
  at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$3.run(MechanicListenerAdapter.java:422) [CraftBook.jar:3.9-SNAPSHOT]
  at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:722) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45]

Caused by: java.lang.NullPointerException

  at com.sk89q.craftbook.mechanics.ic.plc.PlcIC.hashCode(PlcIC.java:144) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.plc.PlcIC.saveState(PlcIC.java:222) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.plc.PlcIC.trySaveState(PlcIC.java:206) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.plc.PlcIC.error(PlcIC.java:307) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.plc.PlcIC.<init>(PlcIC.java:91) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.plc.PlcFactory.create(PlcFactory.java:48) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.ICMechanic.setupIC(ICMechanic.java:163) ~[?:?]
  at com.sk89q.craftbook.mechanics.ic.ICMechanic.onThinkPing(ICMechanic.java:274) ~[?:?]
  at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source) ~[?:?]
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_45]
  at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_45]
  at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-survival.jar:git-Spigot-fdc1440-53fac9f]
  ... 12 more