Hey Mate,
I had the same issue. It was to do with my local cache being invalid, and causing an issue.
To fix it, I jumped into the steamapps\common\ATLAS\ShooterGame directory, and deleted the "Saved" folder. (Verify afterwards just in-case)
This removed all local configuration, so you would have to re-do your in-game settings again like keybinds, sounds, etc, but it should clear the invalid data.