log of `sudo key-mapper-gtk -d`: call command, press `Apply`, then `1` (mapped to udiaeresis, causes [) and then exit the app (input source = en)

gistfile1.txt

sudo key-mapper-gtk -d                
0.00149 INFO: logger.py, line 155, key-mapper 0.7.0 1f8118ae0a214caa6c135a9174fd09a9ad9c136e https://github.com/sezanzeb/key-mapper
0.00170 INFO: logger.py, line 161, python-evdev 1.3.0
0.00172 WARNING: logger.py, line 167, Debug level will log all your keystrokes! Do not post this output in the internet if you typed in sensitive or private information with your device!
0.00175 DEBUG: logger.py, line 173, pid 6853
0.01692 INFO: config.py, line 246, Loaded config from "/home/jonas/.config/key-mapper/config.json"
0.01709 DEBUG: state.py, line 55, Gathering available keycodes
0.02018 DEBUG: state.py, line 92, Writing "/home/jonas/.config/key-mapper/xmodmap.json"
0.06484 WARNING: daemon.py, line 77, The daemon "key-mapper-service" is not running, mapping keys only works as long as the window is open. Try `sudo systemctl start key-mapper`
0.06494 DEBUG: daemon.py, line 214, Creating daemon
0.06587 DEBUG: data.py, line 85, Found data at "/usr/share/key-mapper"
0.15298 DEBUG: getdevices.py, line 115, Discovering device paths
0.15337 SPAM: getdevices.py, line 154, Found "3,7511,44311", "/dev/input/event18", "ZLY ZELOTES GAME MOUSE" 
0.17330 SPAM: getdevices.py, line 154, Found "17,2,1", "/dev/input/event17", "PS/2 Synaptics TouchPad" 
0.29343 SPAM: getdevices.py, line 154, Found "24,1739,52710", "/dev/input/event13", "DLL0945:00 06CB:CDE6 Touchpad" 
0.30929 SPAM: getdevices.py, line 154, Found "24,1739,52710", "/dev/input/event12", "DLL0945:00 06CB:CDE6 Mouse" 
0.33331 SPAM: getdevices.py, line 154, Found "25,0,0", "/dev/input/event11", "Dell WMI hotkeys" 
0.41335 SPAM: getdevices.py, line 154, Found "25,0,0", "/dev/input/event10", "Intel HID 5 button array" 
0.44539 SPAM: getdevices.py, line 154, Found "25,0,0", "/dev/input/event9", "Intel HID events" 
0.47346 SPAM: getdevices.py, line 154, Found "24,1386,18753", "/dev/input/event5", "Wacom HID 4941 Finger" 
0.50146 SPAM: getdevices.py, line 154, Found "30,0,0", "/dev/input/event4", "DP-3" 
0.52150 SPAM: getdevices.py, line 154, Found "25,0,6", "/dev/input/event3", "Video Bus" 
0.54153 SPAM: getdevices.py, line 154, Found "17,1,1", "/dev/input/event2", "AT Translated Set 2 keyboard" 
0.59797 INFO: getdevices.py, line 213, Found "ZLY ZELOTES GAME MOUSE", "PS/2 Synaptics TouchPad", "DLL0945:00 06CB:CDE6 Mouse", "Dell WMI hotkeys", "Wacom HID 4941 Finger", "DP-3", "Video Bus", "AT Translated Set 2 keyboard"
0.59962 DEBUG: presets.py, line 157, The newest preset is "AT Translated Set 2 keyboard", "test"
0.59989 DEBUG: window.py, line 581, Selecting device "AT Translated Set 2 keyboard"
0.60090 DEBUG: window.py, line 333, "AT Translated Set 2 keyboard" presets: "test", "nice navigation and umlauts", "nice navigation"
0.60189 DEBUG: window.py, line 679, Selecting preset "test"
0.60200 INFO: mapping.py, line 162, Loading preset from "/home/jonas/.config/key-mapper/presets/AT Translated Set 2 keyboard/test.json"
0.60228 SPAM: mapping.py, line 195, Key((1, 2, 1),) maps to udiaeresis
0.63129 DEBUG: reader.py, line 146, Starting reading keycodes from "AT Translated Set 2 keyboard"
2.64956 INFO: window.py, line 526, Applying preset "test" for "AT Translated Set 2 keyboard"
2.64992 INFO: config.py, line 246, Loaded config from "/home/jonas/.config/key-mapper/config.json"
2.65003 DEBUG: daemon.py, line 225, Refreshing because last info is too old
2.75133 DEBUG: getdevices.py, line 115, Discovering device paths
2.75205 SPAM: getdevices.py, line 154, Found "3,7511,44311", "/dev/input/event18", "ZLY ZELOTES GAME MOUSE" 
2.76555 SPAM: getdevices.py, line 154, Found "17,2,1", "/dev/input/event17", "PS/2 Synaptics TouchPad" 
2.86563 SPAM: getdevices.py, line 154, Found "24,1739,52710", "/dev/input/event13", "DLL0945:00 06CB:CDE6 Touchpad" 
2.88556 SPAM: getdevices.py, line 154, Found "24,1739,52710", "/dev/input/event12", "DLL0945:00 06CB:CDE6 Mouse" 
2.90556 SPAM: getdevices.py, line 154, Found "25,0,0", "/dev/input/event11", "Dell WMI hotkeys" 
2.95756 SPAM: getdevices.py, line 154, Found "25,0,0", "/dev/input/event10", "Intel HID 5 button array" 
2.97358 SPAM: getdevices.py, line 154, Found "25,0,0", "/dev/input/event9", "Intel HID events" 
3.00159 SPAM: getdevices.py, line 154, Found "24,1386,18753", "/dev/input/event5", "Wacom HID 4941 Finger" 
3.01751 SPAM: getdevices.py, line 154, Found "30,0,0", "/dev/input/event4", "DP-3" 
3.03353 SPAM: getdevices.py, line 154, Found "25,0,6", "/dev/input/event3", "Video Bus" 
3.05765 SPAM: getdevices.py, line 154, Found "17,1,1", "/dev/input/event2", "AT Translated Set 2 keyboard" 
3.09435 INFO: getdevices.py, line 213, Found "ZLY ZELOTES GAME MOUSE", "PS/2 Synaptics TouchPad", "DLL0945:00 06CB:CDE6 Mouse", "Dell WMI hotkeys", "Wacom HID 4941 Finger", "DP-3", "Video Bus", "AT Translated Set 2 keyboard"
3.09460 INFO: mapping.py, line 162, Loading preset from "/home/jonas/.config/key-mapper/presets/AT Translated Set 2 keyboard/test.json"
3.09487 SPAM: mapping.py, line 195, Key((1, 2, 1),) maps to udiaeresis
3.09530 DEBUG: daemon.py, line 437, Using keycodes from "/home/jonas/.config/key-mapper/xmodmap.json"
3.10023 INFO: pid 6868, injector.py, line 307, Starting injecting the mapping for "AT Translated Set 2 keyboard"
3.10144 DEBUG: pid 6868, context.py, line 96, Parsing macros
3.10154 DEBUG: pid 6868, context.py, line 108, No macros configured
3.21160 DEBUG: pid 6868, injector.py, line 158, Grabbing "/dev/input/event2" because of "Key((1, 2, 1),)"
3.21173 DEBUG: pid 6868, injector.py, line 182, Grab /dev/input/event2
3.31434 DEBUG: pid 6868, numlock.py, line 73, numlockx not found
3.31472 DEBUG: pid 6868, injector.py, line 407, Started consumer to inject to /dev/input/event2, fd 33
3.40257 INFO: window.py, line 635, Device "AT Translated Set 2 keyboard" is currently mapped
5.59093 SPAM: pid 6868, keycode_mapper.py, line 437, ((1, 2, 1)) ------------------- maps to 26
5.70994 SPAM: pid 6868, keycode_mapper.py, line 370, ((1, 2, 0)) ------------------- releasing 26
11.7354 DEBUG: window.py, line 259, Closing window
11.7356 DEBUG: reader.py, line 105, Sending close msg to reader
11.7359 DEBUG: reader.py, line 215, Reader stopped
11.7431 INFO: daemon.py, line 457, Stopping all injections
11.7515 INFO: injector.py, line 139, Stopping injecting keycodes for device "AT Translated Set 2 keyboard"
11.7519 DEBUG: pid 6868, injector.py, line 286, Received close signal
11.7520 DEBUG: pid 6868, injector.py, line 388, asyncio coroutines ended
11.7547 DEBUG: numlock.py, line 73, numlockx not found
11.7549 DEBUG: window.py, line 259, Closing window

(key-mapper-gtk:6853): Gtk-CRITICAL **: 00:58:50.619: gtk_main_quit: assertion 'main_loops != NULL' failed