java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at com.lordmau5.ffs.block.tanktiles.BlockTankFrame.removedByPlayer(BlockTankFrame.java:104)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_187103_a(PlayerControllerMP.java:172)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_180511_b(PlayerControllerMP.java:242)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_180512_c(PlayerControllerMP.java:325)
at net.minecraft.client.Minecraft.func_147115_a(Minecraft.java:1421)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2198)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:1961)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1749)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

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