skript slot is fishing rod error

[Skript] Severe Error:

If you're developing an add-on for Skript this likely means that you have done something wrong.
If you're a server admin however please go to http://dev.bukkit.org/server-mods/skript/tickets/
and check whether this error has already been reported.
If not please create a new ticket with a meaningful title, copy & paste this whole error into it,
and describe what you did before it happened and/or what you think caused the error.
If you think that it's a trigger that's causing the error please post the trigger as well.
By following this guide fixing the error should be easy and done fast.

Stack trace:
java.lang.NullPointerException
    at org.bukkit.craftbukkit.v1_7_R3.inventory.CraftInventory.getItem(CraftInventory.java:49)
    at com.w00tmast3r.skriptaddon.skriptplus.elements.expressions.ExprItemInSlot$1.getItem(ExprItemInSlot.java:36)
    at ch.njol.skript.classes.data.DefaultConverters$17.convert(DefaultConverters.java:234)
    at ch.njol.skript.classes.data.DefaultConverters$17.convert(DefaultConverters.java:1)
    at ch.njol.skript.registrations.Comparators$ConvertedComparator.compare(Comparators.java:182)
    at ch.njol.skript.conditions.CondCompare$1$1.check(CondCompare.java:246)
    at ch.njol.skript.lang.util.SimpleExpression.check(SimpleExpression.java:172)
    at ch.njol.skript.lang.util.SimpleLiteral.check(SimpleLiteral.java:176)
    at ch.njol.skript.conditions.CondCompare$1.check(CondCompare.java:242)
    at ch.njol.skript.lang.util.SimpleExpression.check(SimpleExpression.java:172)
    at ch.njol.skript.lang.util.SimpleExpression.check(SimpleExpression.java:160)
    at ch.njol.skript.lang.util.SimpleExpression.check(SimpleExpression.java:155)
    at ch.njol.skript.conditions.CondCompare.check(CondCompare.java:239)
    at ch.njol.skript.lang.Condition.run(Condition.java:58)
    at ch.njol.skript.lang.Conditional.walk(Conditional.java:51)
    at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:91)
    at ch.njol.skript.effects.Delay$1.run(Delay.java:85)
    at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java:67)
    at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:635)
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283)
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583)
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489)
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628)

Version Information:
  Skript: 2.1.2
  Bukkit: 1.7.9-R0.3-SNAPSHOT
  Minecraft: 1.7.9
  Java: 1.7.0

Running CraftBukkit: false

Current node: null
Current item: slot is equal to [[itemtype:fishing rod]] (comparator: ConvertedComparator(ch.njol.skript.classes.data.DefaultConverters$17@5b82665d,ch.njol.skript.classes.data.DefaultComparators$2@4e0e929a,null))

Thread: Server thread

End of Error.