[Archlinux][pamac 8.0.0-beta] after fix for #599, cannot remove an AUR package, "waiting for another package manager to end"

I built using pamac-aur-git PKGBUILD a pamac version with fix for #599 (closed) included.

I added quakespam-svn from AUR. It built correctly but pamac core dumped.

I wanted after a logout and login into Mate to remove it using pamac. I cannot do so. Just look at attached screenshot. I canceled action and removed it from command line.