Bug report

Factorio gave me the following error then crashed to main menu:

The mod Clock (1.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event clock::on_tick (ID 0)
LuaGuiElement API call when LuaGuiElement was invalid.
stack traceback:
[C]: in function 'newindex'
__clock/control.lua:115: in function <clock/control.lua:81>

Details

I encountered this bug during the production challenge game mode. This error occurred just as the gamemode's time limit elapsed while I attempted to move an item from my inventory into my hand (cursor).