I have an unnamed window which can not be closed, what can I do?

Hi!
I have a window titled as "unnamed window" which can not be closed. I am unable to get its PID. Neither Xkill utility and Xprop doesn't work. Xprop doesn't report anything when I click on it.

I know it was said in jest (Or I think it was), but even in the worst case, there is no need to reboot - just restart X.
I suspect the name "unnamed window" is not useful, as that is likely the window manager's default when it either cant get the window attributes, or when the window attributes contain a NULL string.
I am also guessing this is a tilingWM - is this awesomewm?  I suspect this as I've seen this problem with some programs that crash after having mapped a window but before they have drawn anything to it.  This window will remain in the WM's listing of windows, but it will not be at all functional.  Often it will not even be "visible" - but if you have a  tiling wm, it will take up a tile space.
I've been thinking of writing a little utility to remove such dead-windows.

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