During pamac update of AUR packages: "parallel: Warning: $HOME not set. Using /tmp"

Hello,

at the end of the update of my AUR packages in pamac, I had the following message that I can now read in the /var/log/pacman.log:
[ALPM-SCRIPTLET] parallel: Warning: $HOME not set. Using /tmp.

In this forum post, @GaVenga wrote :

Reason:
ZDOTDIR=$HOME
missing in .zshrc

Since my shell used is bash and not zsh, I have found no ~/.zshrc on my computer. I have looked quickly on the parallel file for bash, namely ~/.bashrc and have not found a line with ZDOTDIR= in it.

Should I change my shell from bash to zsh?

Or what should I do? And what exactly this following line mean?
[ALPM-SCRIPTLET] parallel: Warning: $HOME not set. Using /tmp.

Thank you for your attention!

Best,