[16:12:13 ERROR]: Could not pass event PlayerInteractEvent to MyFirstPlugin v1.0

org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callPlayerInte
ractEvent(CraftEventFactory.java:226) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-
ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.PlayerInteractManager.interact(PlayerInt
eractManager.java:374) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096j
nks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java
:629) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInBlockPlace.a(SourceFile:60)
[Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInBlockPlace.handle(SourceFile
:9) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157
) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [Craf
tbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:6
67) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
60) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
58) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]
Caused by: java.lang.NullPointerException
        at me.bukkit.Garnetty.PluginMain.onPlayerInteract(PluginMain.java:88) ~[
?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_67]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[Craftbukkit.jar:git-Bukkit-1.7.9-R0.2-10-ge6cd8c0-b3096jnks]