DESERT

Inside the methodPlugIn::recvSyncClMsg(ClMessage *m) a check on dynamic casts is needed.
Fix:

int
PlugIn::recvSyncClMsg(ClMessage *m)
{
    if (m->type() == CLMSG_DISCOVERY) {
        Tcl &tcl = Tcl::instance();
        tcl.evalf("%s info class", name());
        const char *class_name = tcl.result();
        auto dyn_msg = dynamic_cast<ClMsgDiscovery *>(m);
        if (dyn_msg != nullptr) {
            dyn_msg->addData((const PlugIn *) this,
                        getLayer(),
                        getStackId(),
                        getId(),
                        class_name,
                        getTag());
            return 0;
        }
    } else if (m->type() == CLMSG_STATS) {
        auto dyn_msg = dynamic_cast<ClMsgStats *>(m);
        if (dyn_msg != nullptr) {
            dyn_msg->setStats(stats_ptr);
            return 0;
        }
    }
    // return error in case of wrong type id or dynamic cast error
    return RETVAL_NOT_IMPLEMENTED;
}