diff --git a/cmd/XDC/main.go b/cmd/XDC/main.go
index d6fa3ebdee..732be48972 100644
--- a/cmd/XDC/main.go
+++ b/cmd/XDC/main.go
@@ -294,9 +294,10 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 		if ok, err := ethereum.ValidateMiner(); err != nil {
 			utils.Fatalf("Can't verify validator permission: %v", err)
 		} else if !ok {
-			utils.Fatalf("Only validator can mine blocks")
+			log.Info("Only validator can mine blocks. Cancel mining on this node")
+			return
 		}
-		
+
 		// Use a reduced number of threads if requested
 		if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
 			type threaded interface {
diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index 2de2a84625..e5795b0282 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -367,6 +367,16 @@ func (c *Clique) verifyCascadingFields(chain consensus.ChainReader, header *type
 	return c.verifySeal(chain, header, parents)
 }
 
+func (c *Clique) GetSnapshot(chain consensus.ChainReader, header *types.Header) (*Snapshot, error) {
+	number := header.Number.Uint64()
+	log.Trace("take snapshot", "number", number, "hash", header.Hash())
+	snap, err := c.snapshot(chain, number, header.Hash(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return snap, nil
+}
+
 // snapshot retrieves the authorization snapshot at a given point in time.
 func (c *Clique) snapshot(chain consensus.ChainReader, number uint64, hash common.Hash, parents []*types.Header) (*Snapshot, error) {
 	// Search for a snapshot in memory or on disk for checkpoints
@@ -575,8 +585,8 @@ func (c *Clique) Finalize(chain consensus.ChainReader, header *types.Header, sta
 	chainReward := new(big.Int).SetUint64(chain.Config().Clique.Reward * params.Ether)
 
 	reward := new(big.Int).Set(chainReward)
-    state.AddBalance(header.Coinbase, reward)
-	
+	state.AddBalance(header.Coinbase, reward)
+
 	// No block rewards in PoA, so the state remains as is and uncles are dropped
 	header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
 	header.UncleHash = types.CalcUncleHash(nil)
@@ -689,4 +699,4 @@ func (c *Clique) APIs(chain consensus.ChainReader) []rpc.API {
 		Service:   &API{chain: chain, clique: c},
 		Public:    false,
 	}}
-}
+}
\ No newline at end of file
diff --git a/eth/backend.go b/eth/backend.go
index 716e676192..f3b188cdbc 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -339,17 +339,19 @@ func (s *Ethereum) ValidateMiner() (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	if c, ok := s.engine.(*clique.Clique); !ok {
-		return false, fmt.Errorf("Only verify miners in Clique protocol")
-	} else {
+	if s.chainConfig.Clique != nil {
 		//check if miner's wallet is in set of validators
+		c := s.engine.(*clique.Clique)
 		snap, err := c.GetSnapshot(s.blockchain, s.blockchain.CurrentHeader())
 		if err != nil {
 			return false, fmt.Errorf("Can't verify miner: %v", err)
 		}
 		if _, authorized := snap.Signers[eb]; !authorized {
-			return false, fmt.Errorf("This miner doesn't belong to set of validators")
+			//This miner doesn't belong to set of validators
+			return false, nil
 		}
+	} else {
+		return false, fmt.Errorf("Only verify miners in Clique protocol")
 	}
 	return true, nil
 }