Bukkit

What steps will reproduce the problem?
during the game

What version of the plugin are you using?
22

Do you have an error log of what happened?
15:54:46 [AVVERTENZA] Failed to handle packet: java.lang.NullPointerException
java.lang.NullPointerException
        at com.gmail.mooman219.build.blocks.SBLongGrass.a(SBLongGrass.java:53)
        at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager
.java:251)
        at net.minecraft.server.ItemInWorldManager.dig(ItemInWorldManager.java:1
55)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:537)
        at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java
:129)
        at net.minecraft.server.Packet14BlockDig.handle(SourceFile:43)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
        at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java
:169)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:7
8)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Please provide any additional information below.
CB 1.2.5 - 2149; vault -1.2.15-b172; RPG Essentials - 1.2.9; Essentials - 2.9.1