See michaelzangl/minebot#108

You can fix this by replacing the key access to use the isPressed/isKeyDown methods of the key binding if you need to know if that key is pressed.

See #57 you should have commented there :P

I did try to recompile before, using isKeyDown, but I got an error saying it is deprecated (isPressed too).

Anyways adding this to the beginning of FireUseBlockEvents fixed it for me: if(mc.gameSettings.keyBindUseItem.getKeyCode()>Keyboard.KEYBOARD_SIZE){return;}

P.S. @Zyin055 have a look at the net.minecraftforge.client.event.GuiScreenEvent.MouseInputEvent and GuiScreenEvent.KeyboardInputEvent events for catching clicks and keystrokes when GUIs are open too.