java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at mcjty.deepresonance.integration.computers.TankDriver$OCDriver$InternalManagedEnvironment.getStrength(TankDriver.java:54)
at generated.li.cil.oc.CallWrapper_mcjty_deepresonance_integration_computers_TankDriver$OCDriver$InternalManagedEnvironment_getStrength.call(Unknown Source)
at li.cil.oc.server.machine.Callbacks$ComponentCallback.apply(Callbacks.scala:123)
at li.cil.oc.server.network.Component$class.invoke(Component.scala:112)
at li.cil.oc.server.network.Network$ComponentBuilder$$anon$2.invoke(Network.scala:600)
at li.cil.oc.server.machine.Machine.invoke(Machine.scala:356)
at li.cil.oc.server.machine.luac.ComponentAPI$$anonfun$initialize$5$$anonfun$apply$6.apply(ComponentAPI.scala:78)
at li.cil.oc.server.machine.luac.ComponentAPI$$anonfun$initialize$5$$anonfun$apply$6.apply(ComponentAPI.scala:78)
at li.cil.oc.server.machine.luac.NativeLuaArchitecture.invoke(NativeLuaArchitecture.scala:55)
at li.cil.oc.server.machine.luac.ComponentAPI$$anonfun$initialize$5.apply(ComponentAPI.scala:78)
at li.cil.oc.server.machine.luac.ComponentAPI$$anonfun$initialize$5.apply(ComponentAPI.scala:74)
at li.cil.oc.util.ExtendedLuaState$ExtendedLuaState$$anon$1.invoke(ExtendedLuaState.scala:24)
at li.cil.repack.com.naef.jnlua.LuaState.lua_pcall(Native Method)
at li.cil.repack.com.naef.jnlua.LuaState.call(LuaState.java:677)
at li.cil.oc.server.machine.luac.NativeLuaArchitecture.runSynchronized(NativeLuaArchitecture.scala:177)
at li.cil.oc.server.machine.Machine.update(Machine.scala:560)
at li.cil.oc.server.component.Server.update(Server.scala:203)
at li.cil.oc.common.inventory.ComponentInventory$class.updateComponents(ComponentInventory.scala:38)
at li.cil.oc.common.tileentity.Rack.updateComponents(Rack.scala:32)
at li.cil.oc.common.tileentity.Rack.updateEntity(Rack.scala:369)
at li.cil.oc.common.tileentity.traits.Tickable$class.update(Tickable.scala:6)
at li.cil.oc.common.tileentity.Rack.func_73660_a(Rack.scala:32)
at net.minecraft.world.World.func_72939_s(World.java:1802)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:149)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Thread.java:745)

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