Crash report

java.lang.NullPointerException: Updating screen events
	at brainstonemod.common.item.energy.ItemBrainStoneLifeCapacitor.canEquip(ItemBrainStoneLifeCapacitor.java:466)
	at baubles.api.cap.BaublesContainer.isItemValidForSlot(BaublesContainer.java:33)
	at baubles.api.inv.BaublesInventoryWrapper.isItemValidForSlot(BaublesInventoryWrapper.java:82)
	at crazypants.util.ShadowInventory.isItemValidForSlot(ShadowInventory.java:61)
	at crazypants.enderio.machine.capbank.ContainerCapBank$5.isItemValid(ContainerCapBank.java:146)
	at net.minecraft.inventory.Container.slotClick(Container.java:310)
	at net.minecraft.client.multiplayer.PlayerControllerMP.windowClick(PlayerControllerMP.java:594)
	at net.minecraft.client.gui.inventory.GuiContainer.handleMouseClick(GuiContainer.java:685)
	at net.minecraft.client.gui.inventory.GuiContainer.mouseReleased(GuiContainer.java:641)
	at com.enderio.core.client.gui.GuiContainerBase.mouseReleased(GuiContainerBase.java:254)
	at net.minecraft.client.gui.GuiScreen.handleMouseInput(GuiScreen.java:627)
	at com.enderio.core.client.gui.GuiContainerBase.handleMouseInput(GuiContainerBase.java:176)
	at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:583)
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1797)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1118)
	at net.minecraft.client.Minecraft.run(Minecraft.java:406)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)