New comment by zen0bit on void-packages repository https://github.com/void-linux/void-packages/pull/36121#issuecomment-1067392671 Comment: Looks like I found [solution](https://github.com/fish-shell/fish-shell/blob/master/share/functions/fish_title.fish) Maybe add patch for it? Never do that ... change `"[$(prompt_hostname | string sub -l 10)]"` to `"["(prompt_hostname | string sub -l 10 | string collect)"]"` no error for me after change...