Error sketchmapload

[11:38:46 ERROR]: Could not pass event PlayerInteractEntityEvent to SketchMap v1.0.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:297) ~[craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:1201) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.PacketPlayInUseEntity.a(SourceFile:52) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.PacketPlayInUseEntity.a(SourceFile:11) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_55]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_55]
at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:656) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:609) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:517) [craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
at java.lang.Thread.run(Thread.java:744) [?:1.7.0_55]
Caused by: java.lang.NullPointerException
at com.mcplugindev.slipswhitley.sketchmap.listener.PlayerListener.onPlayerInteract(PlayerListener.java:29) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_55]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_55]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_55]
at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_55]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:295) ~[craftbukkit-1.8-R0.6.jar:git-Bukkit-33d5de3]
... 14 more