Fail to connect due to "property “otp-flags” invalid or not supported"

[Yzmo]

When I try to connect to my university VPN with network-manager, i get this:

I use Ubuntu 18.04.1

apt-cache policy network-manager-fortisslvpn
network-manager-fortisslvpn:
  Installed: 1.2.8-1build1
  Candidate: 1.2.8-1build1
  Version table:
 *** 1.2.8-1build1 500
        500 http://ftp.acc.umu.se/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

I expect it to connect, instead i get a connection failed popup.

in syslog:
Feb 8 11:33:15 belacqua NetworkManager[1036]: <info> [1549621995.9290] vpn-connection[0x5641e6c64100,d79f202b-fa77-40d1-ab0e-7c638cca2e48,"LU Forti",0]: Started the VPN service, PID 19990
Feb 8 11:33:15 belacqua NetworkManager[1036]: <info> [1549621995.9537] vpn-connection[0x5641e6c64100,d79f202b-fa77-40d1-ab0e-7c638cca2e48,"LU Forti",0]: Saw the service appear; activating connection
Feb 8 11:33:16 belacqua NetworkManager[1036]: <info> [1549621996.0668] vpn-connection[0x5641e6c64100,d79f202b-fa77-40d1-ab0e-7c638cca2e48,"LU Forti",0]: VPN connection: (ConnectInteractive) reply received
Feb 8 11:33:16 belacqua NetworkManager[1036]: <warn> [1549621996.0680] vpn-connection[0x5641e6c64100,d79f202b-fa77-40d1-ab0e-7c638cca2e48,"LU Forti",0]: VPN connection: failed to connect: 'property “otp-flags” invalid or not supported'
Feb 8 11:33:16 belacqua NetworkManager[1036]: <info> [1549621996.0786] vpn-connection[0x5641e6c64100,d79f202b-fa77-40d1-ab0e-7c638cca2e48,"LU Forti",0]: VPN service disappeared

Note the 'property “otp-flags” invalid or not supported'. I think this is a bug since connecting with the CLI-interface works.

Thanks!