seafile-applet cores dump instantly II: No such slot AccountManager::reloginAccount

[kforner]

pkill -f seaf
seafile-applet
Segmentation fault (core dumped)

If I look at the log ~/.ccnet/logs/applet.log, I see:

[10/10/2018 11:35:43 AM]QObject::connect: No such slot AccountManager::reloginAccount(const Account &)
[10/10/2018 11:35:43 AM]starting ccnet:  ("-c", "/home/karl/.ccnet")

config:

$ dpkg -l | grep seaf
ii  libseafile0                                       6.1.8-1240~ubuntu16.04.1                     amd64        Shared libraries for Seafile
ii  seafile-cli                                       6.1.8-1240~ubuntu16.04.1                     amd64        Seafile command line interface.
ii  seafile-daemon                                    6.1.8-1240~ubuntu16.04.1                     amd64        Seafile daemon
ii  seafile-gui                                       6.1.8-1431~ubuntu16.04.1                     amd64        Seafile desktop client.

Ubuntu 16.04.5 LTS

Linux 4.15.0-36-generic #39~16.04.1-Ubuntu SMP