Can't migrate burpui to 0.6.5

Burp

$ burp -V
burp-2.2.18

Sysinfo

$ bui-manage sysinfo
bui-manage sysinfo
Python version:      3.5.2
Burp-UI version:     0.6.5 (stable)
OS:                  Linux:5.0.5-200.fc29.x86_64 (posix)
Distribution:        Ubuntu 16.04 xenial
Single mode:         True
Backend version:     2
WebSocket embedded:  False
WebSocket available: True
Config file:         /etc/burp/burpui.cfg

More information: https://github.com/CoffeeITWorks/ansible_burpui_server/issues/15