diff --git a/consensus/consensus_v2.go b/consensus/consensus_v2.go
index 57fa4ef9b..25045a3f1 100644
--- a/consensus/consensus_v2.go
+++ b/consensus/consensus_v2.go
@@ -522,6 +522,7 @@ func (consensus *Consensus) commitBlock(blk *types.Block, committedMsg *FBFTMess
 	}
 	if !committedMsg.HasSingleSender() {
 		consensus.getLogger().Error().Msg("[TryCatchup] Leader message can not have multiple sender keys")
+		return errIncorrectSender
 	}
 
 	atomic.AddUint64(&consensus.blockNum, 1)
diff --git a/consensus/fbft_log.go b/consensus/fbft_log.go
index f66cebb46..d578030c4 100644
--- a/consensus/fbft_log.go
+++ b/consensus/fbft_log.go
@@ -90,6 +90,8 @@ func (m *FBFTMessage) id() fbftMsgID {
 	if m.HasSingleSender() {
 		copy(id[idTypeBytes+idViewIDBytes+idHashBytes:], m.SenderPubkeys[0].Bytes[:])
 	} else {
+		// Currently this case is not reachable as only validator will use id() func
+		// and validator won't receive message with multiple senders
 		copy(id[idTypeBytes+idViewIDBytes+idHashBytes:], m.SenderPubkeyBitmap[:])
 	}
 	return id
diff --git a/consensus/view_change_construct.go b/consensus/view_change_construct.go
index 194dc060d..8fa29433a 100644
--- a/consensus/view_change_construct.go
+++ b/consensus/view_change_construct.go
@@ -241,7 +241,7 @@ var (
 	errVerifyM2        = errors.New("failed to verfiy signature for M2 message")
 	errM1Payload       = errors.New("failed to verify multi signature for M1 prepared payload")
 	errNoQuorum        = errors.New("no quorum on M1 (prepared) payload")
-	errIncorrectSender = errors.New("view change msg must have only one sender")
+	errIncorrectSender = errors.New("multiple senders not allowed")
 )
 
 // ProcessViewChangeMsg process the view change message after verification