Path with spaces causes error on MacOS

[PawelKwiecinski]

$> git diff
/Volumes
.
.
Data/Users/user_dir/GitHub/git-diff-image/git_diff_image: /Volumes: is a directory
/Volumes
.
.
Data/Users/user_dir/GitHub/git-diff-image/git_diff_image: line 1: .: filename argument required
.: usage: . filename [arguments]
fatal: external diff died, stopping at features/login/screenshots/de-DE_login_idle.png

The project dir /Volumes/Macintosh HD - Data/Users/user_dir/GitHub/project