In XMonad, bspwm, i3wm, and herbstluftwm I get the following error (they always come in trios) when starting xsecurelock (either from a terminal, or if configured with xss-lock doing xset s activate):

2024年04月06日T12:02:59Z 1212782 xsecurelock: Got non-fatal X11 error: BadWindow (invalid Window parameter).
2024年04月06日T12:02:59Z 1212782 xsecurelock: Got non-fatal X11 error: BadWindow (invalid Window parameter).
2024年04月06日T12:02:59Z 1212782 xsecurelock: Got non-fatal X11 error: BadWindow (invalid Window parameter).

I am not running a compositor.

This does not happen under LXQT and xfce4.

I am running Debian, xsecurelock version 1.9.0.

On another computer (where I have only XMonad, xfce and LXQT, also Debian, similar configuration) I observe the same thing: error in XMonad, no errors in xfce and LXQT.

I've seen #177 but that seems to be different.