Updating python to the Debian's testing branch seems to resolve the issue:
Add 'testing' to sources.list:
# sudo nano /etc/apt/sources.list
deb http://ftp.de.debian.org/debian testing main
Make the 'stable' repository default on your server:
Code
# echo 'APT::Default-Release "stable";' | sudo tee -a /etc/apt/apt.conf.d/00local
# sudo nano /etc/apt/preferences
Package: *
Pin: release a=stable
Pin-Priority: 900
Package: *
Pin: release o=Debian
Pin-Priority: -10
Install updated python3 (this updated me to Python3.7.2+)
# sudo apt-get update
# sudo apt-get -t testing install python3
Based on: https://www.rosehosting.com/bl…python-3-6-4-on-debian-9/ and https://unix.stackexchange.com…to-set-default-apt-source