Changing my keybinds prevents the game from starting again

[UnclePsymon]

Hi! So, for some reason my game refuses to open properly after I modified my keybinds. The game does start, but the window never appears. Removing the keybindings.txt fixes the issue. I play on Linux and it happens with the Windows version via Proton as well as the native Linux version.
This gets spamed in the terminal with the Linux version:

Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"
Error loading keybindings: ./keybindings.txt: line: 55 column: 36:
Unknown key code: "KEY_MODIFIER"

So I changed the value KEY_MODIFIER to DELETE, and it works now. Maybe something worth to take a look at ;)

keybindings.txt