crash after selecting MO2 install dir - unbound variable

[RandomHuman2020]

While installing MO2 the script crashes after selecting the install directory, showing an unbound variable issue.

Terminal Log:

https://pastebin.com/eR2bJCnu
(using pastebin because github messes up the formatting, and to save on space in the issue)

General Information:

Installer version 5.0.2
Distro: KDE neon 6
Steam Install Method: Native
I have already checked for duplicates, and found none.