i3-easyfocus floating window error

debug.out

[src/xcb.c:323] trying to open font: -*-terminus-bold-*-*-*-32-*-*-*-*-*-*-*
[src/xcb.c:303] registering for configure notify event
[src/xcb.c:220] try to grab key (keysym: 65293)
[src/xcb.c:233] translated keysym '65293' to keycode '36'
[src/xcb.c:46] grab key (keycode: 36)
[src/ipc.c:84] find visible container in con '34615456'
[src/ipc.c:54] found window (id: 140728932936640, window: 44040205, x: 0, y: 0)
[src/ipc.c:54] found window (id: 34616272, window: 33554639, x: 960, y: 0)
[src/ipc.c:54] found window (id: 140728933048960, window: 31457487, x: 481, y: 142)
[src/xcb.c:220] try to grab key (keysym: 97)
[src/xcb.c:233] translated keysym '97' to keycode '38'
[src/xcb.c:46] grab key (keycode: 38)
[src/xcb.c:140] create window (id: 50331649, x: 0, y: 0): a
[src/xcb.c:220] try to grab key (keysym: 115)
[src/xcb.c:233] translated keysym '115' to keycode '39'
[src/xcb.c:46] grab key (keycode: 39)
[src/xcb.c:140] create window (id: 50331651, x: 960, y: 0): s
[src/xcb.c:220] try to grab key (keysym: 100)
[src/xcb.c:233] translated keysym '100' to keycode '40'
[src/xcb.c:46] grab key (keycode: 40)
[src/xcb.c:140] create window (id: 50331653, x: 481, y: 142): d
[src/xcb.c:253] waiting for xcb event
[src/xcb.c:289] focus in event
[src/xcb.c:265] key press event (keycode: 40, keysym: 100)
[src/i3-easyfocus.c:234] selection: 100
[src/i3-easyfocus.c:162] window (id: 140728933048960, window: 31457487)
[src/ipc.c:327] focusing window (id: 140728933048960)
[src/ipc.c:336] focus command returned error: (null)
cannot focus window