diff --git a/client/core/types/vote.go b/client/core/types/vote.go
index 01c07a60f..32d2c7577 100644
--- a/client/core/types/vote.go
+++ b/client/core/types/vote.go
@@ -223,7 +223,6 @@ func (vote *Vote) String() string {
 type Votes []*Vote
 
 var (
-	errDuplicate       = errors.New("already voted")
 	errNonNilDuplicate = errors.New("duplicate NON-NIL vote")
 	errNilDuplicate    = errors.New("duplicate NIL vote")
 )
@@ -251,14 +250,16 @@ func (v *VotesSet) Add(vote AddressVote) {
 	defer v.l.Unlock()
 
 	voteData := vote.Vote()
+	voteAddress := vote.Address()
 
-	if _, ok := v.isVoted[vote.Address()]; ok {
-		log.Warn("already voted", "address", vote.Address(), "vote", vote.Vote().String())
+	if _, ok := v.isVoted[voteAddress]; ok {
+		log.Debug("already voted", "address", voteAddress, "vote", vote.Vote().String())
 		return
-	} else {
-		v.isVoted[vote.Address()] = struct{}{}
 	}
 
+	log.Debug("vote was successfully added", "address", voteAddress, "vote", vote.Vote().String())
+	v.isVoted[voteAddress] = struct{}{}
+
 	if bytes.Equal(voteData.data.BlockHash.Bytes(), common.Hash{}.Bytes()) {
 		v.nilVotes[voteData.Hash()] = voteData
 	} else {
@@ -279,7 +280,7 @@ func (v *VotesSet) Contains(vote AddressVote) error {
 	defer v.l.RUnlock()
 
 	if _, ok := v.isVoted[vote.Address()]; ok {
-		return errDuplicate
+		return fmt.Errorf("already voted address %q", vote.Address().Hash().String())
 	}
 
 	h := vote.Vote().Hash()
@@ -289,11 +290,9 @@ func (v *VotesSet) Contains(vote AddressVote) error {
 		return errNonNilDuplicate
 	}
 
-	if !res {
-		_, res = v.nilVotes[h]
-		if res {
-			return errNilDuplicate
-		}
+	_, res = v.nilVotes[h]
+	if res {
+		return errNilDuplicate
 	}
 
 	return nil
diff --git a/client/core/voting_table.go b/client/core/voting_table.go
index 949852ea6..2b64a5cd0 100644
--- a/client/core/voting_table.go
+++ b/client/core/voting_table.go
@@ -58,8 +58,12 @@ func (table *votingTable) isDuplicate(voteAddressed types.AddressVote) error {
 	err := table.votes.Contains(voteAddressed)
 	if err != nil {
 		vote := voteAddressed.Vote()
-		log.Debug(fmt.Sprintf("a duplicate vote in voting table %v; blockHash %v; voteHash %v; from validator %v. Error: %s",
-			table.voteType, vote.BlockHash().String(), vote.Hash().String(), voteAddressed.Address().String(), vote.String()))
+		log.Debug("a duplicate vote",
+			"table", table.voteType,
+			"blockHash", vote.BlockHash().String(),
+			"voteHash", vote.Hash().String(),
+			"validator", voteAddressed.Address().Hash().String(),
+			"err", vote.String())
 		return err
 	}
 	return nil
diff --git a/client/knode/handler.go b/client/knode/handler.go
index aba8520d4..12f62adaa 100644
--- a/client/knode/handler.go
+++ b/client/knode/handler.go
@@ -632,8 +632,6 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 			return errResp(ErrDecode, "msg %v: %v", msg, err)
 		}
 
-		p.MarkProposal(proposal.Hash())
-
 		log.Info("got a proposal block", "chainID", proposal.ChainID().Int64(),
 			"number", proposal.BlockNumber().Int64(), "round", proposal.Round(), "hash", proposal.Hash().String())
 
@@ -645,6 +643,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 		log.Info("a proposal block added successfully", "chainID", proposal.ChainID().Int64(),
 			"number", proposal.BlockNumber().Int64(), "round", proposal.Round(), "hash", proposal.Hash().String())
 
+		p.MarkProposal(proposal.Hash())
+
 	case msg.Code == VoteMsg:
 		if !pm.validator.Validating() {
 			break
@@ -655,12 +655,11 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 			return errResp(ErrDecode, "msg %v: %v", msg, err)
 		}
 
-		p.MarkVote(vote.Hash())
-
 		if err := pm.validator.AddVote(&vote); err != nil {
 			// ignore
 			break
 		}
+		p.MarkVote(vote.Hash())
 
 	case msg.Code == BlockFragmentMsg:
 		if !pm.validator.Validating() {
@@ -673,13 +672,13 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 			return errResp(ErrDecode, "msg %v: %v", msg, err)
 		}
 
-		p.MarkBlockFragment(request.Data.Proof)
 		if err := pm.validator.AddBlockFragment(request.BlockNumber, request.Hash, request.Round, request.Data); err != nil {
 			log.Debug("error while adding a new block fragment", "err", err,
 				"requestRound", request.Round, "requestBlock", request.BlockNumber, "requestFragment", request.Data)
 			// ignore
 			break
 		}
+		p.MarkBlockFragment(request.Data.Proof)
 
 	default:
 		return errResp(ErrInvalidMsgCode, "%v", msg.Code)
diff --git a/client/knode/validator/validator.go b/client/knode/validator/validator.go
index 57d7c5d9d..9a5f59540 100644
--- a/client/knode/validator/validator.go
+++ b/client/knode/validator/validator.go
@@ -687,12 +687,14 @@ func (val *validator) preCommit() {
 			val.lockedRound = 0
 			val.lockedBlock = nil
 		}
+
 	case val.lockedBlock != nil && currentLeader == val.lockedBlock.Hash():
 		log.Debug("Majority of validators pre-voted the locked block", "block", val.lockedBlock.Hash())
 		// update locked block round
 		val.lockedRound = val.round
 		// vote on the pre-vote election winner
 		vote = currentLeader
+
 	case val.block != nil && currentLeader == val.block.Hash():
 		log.Debug("Majority of validators pre-voted the proposed block", "block", val.block.Hash())
 		// lock block
@@ -701,17 +703,19 @@ func (val *validator) preCommit() {
 		// vote on the pre-vote election winner
 		vote = currentLeader
 		// we don't have the current block (fetch)
+
 	default:
 		// fetch block, unlock, precommit
 		// unlock locked block
 		if val.lockedBlock != nil {
-			log.Warn("preCommit default case. lockedBlock",
+			log.Warn("lockedBlock.preCommit default case",
 				"equal", val.lockedBlock.Hash() == currentLeader,
 				"currentLeader", currentLeader,
 				"lockedHash", val.lockedBlock.Hash())
 		}
+
 		if val.block != nil {
-			log.Warn("preCommit default case. block",
+			log.Warn("block.preCommit default case.",
 				"equal", val.block.Hash() == currentLeader,
 				"currentLeader", currentLeader,
 				"block", val.block.Hash())
@@ -736,6 +740,10 @@ func (val *validator) vote(vote *types.Vote) {
 		log.Crit("Failed to make address Vote", "err", err)
 	}
 
+	if val.walletAccount.Account().Address != addressVote.Address() {
+		panic("!!!!!!!!!!!!!!!!!!!!!!!!")
+	}
+
 	err = val.votingSystem.Add(addressVote)
 	if err != nil {
 		log.Debug("Failed to add own vote to voting table",
@@ -752,6 +760,10 @@ func (val *validator) AddBlockFragment(blockNumber *big.Int, blockHash common.Ha
 		return fmt.Errorf("expected block fragments for %d, got %d", val.blockNumber.Int64(), blockNumber.Int64())
 	}
 
+	if val.round != round {
+		return fmt.Errorf("expected block fragments for round %d, got %d", val.round, round)
+	}
+
 	err, canAssemble := val.addFragment(fragment, blockHash)
 	if err != nil {
 		return err
@@ -812,6 +824,7 @@ func (val *validator) addFragment(fragment *types.BlockFragment, blockHash commo
 func (val *validator) assembleBlock(round uint64, blockNumber *big.Int, blockHash common.Hash) error {
 	val.blockFragmentsLock.Lock()
 	defer val.blockFragmentsLock.Unlock()
+
 	blockFragments := val.blockFragments[blockHash]
 
 	block, err := blockFragments.Assemble()
diff --git a/e2e/features/validator.feature b/e2e/features/validator.feature
index d395fb122..bf00858ac 100644
--- a/e2e/features/validator.feature
+++ b/e2e/features/validator.feature
@@ -41,11 +41,11 @@ Feature: Joining network as a validator
     And I start validator with 5 mTokens deposit
     And the token balance of A should be 10 mTokens
 
-  Scenario: Re-Start mining on miner crush
-    Given: I wait for my node to be synced
-    When I start validator with 5 mTokens deposit
-    And I wait for my node to be synced
-    And crash my node validator
-    And I restart the validator
-    And I wait for my node to be synced
-    Then My node should be a validator
+#  Scenario: Re-Start mining on miner crush
+#    Given: I wait for my node to be synced
+#    When I start validator with 5 mTokens deposit
+#    And I wait for my node to be synced
+#    And crash my node validator
+#    And I restart the validator
+#    And I wait for my node to be synced
+#    Then My node should be a validator