Downgrading libsyncdaemon-1.0-1 to 2.0.0-0ubuntu4 fixed it, so apparently the crash was introduced in libsyncdaemon-1.0-1 2.99.0-0ubuntu1
Downgrading libsyncdaemon-1.0-1 to 2.0.0-0ubuntu4 fixed it, so apparently the crash was introduced in libsyncdaemon-1.0-1 2.99.0-0ubuntu1