fix qbft panic

plugin/consensus/qbft/node.go

@@ -459,7 +459,8 @@ func (node *Node) addPeer(pc *peerConn) error {
 	}
 
 	qbftlog.Info("Added peer", "peer", pc.ip)
-	stateMsg := MsgInfo{TypeID: ttypes.NewRoundStepID, Msg: node.state.RoundStateMessage(), PeerID: pc.id, PeerIP: pc.ip.String()}
+	rs := node.state.GetRoundState()
+	stateMsg := MsgInfo{TypeID: ttypes.NewRoundStepID, Msg: rs.RoundStateMessage(), PeerID: pc.id, PeerIP: pc.ip.String()}
 	pc.Send(stateMsg)
 	qbftlog.Info("Send state msg", "msg", stateMsg, "ourIP", node.IP, "ourID", node.ID)
 	return nil

plugin/consensus/qbft/peer_set.go

@@ -412,6 +412,10 @@ func (pc *peerConn) PickSendVote(votes ttypes.VoteSetReader) bool {
 		}
 	}
 	if vote, ok := pc.state.PickVoteToSend(votes); ok {
+		if vote == nil {
+			qbftlog.Warn("Pick nil vote", "aggVote", votes.GetAggVote(), "vote", votes)
+			return false
+		}
 		msg := MsgInfo{TypeID: ttypes.VoteID, Msg: vote.QbftVote, PeerID: pc.id, PeerIP: pc.ip.String()}
 		qbftlog.Debug("Sending vote message", "msg", msg)
 		if pc.Send(msg) {