diff --git a/src/neo/Consensus/ConsensusService.cs b/src/neo/Consensus/ConsensusService.cs
index e39eab19b2..6995310af4 100644
--- a/src/neo/Consensus/ConsensusService.cs
+++ b/src/neo/Consensus/ConsensusService.cs
@@ -319,11 +319,11 @@ private void OnConsensusPayload(ConsensusPayload payload)
         private void OnPersistCompleted(Block block)
         {
             Log($"persist block: height={block.Index} hash={block.Hash} tx={block.Transactions.Length}");
+            knownHashes.Clear();
+            InitializeConsensus(0);
             DateTime now = TimeProvider.Current.UtcNow;
             block_received_gap = now - block_received_time;
             block_received_time = now;
-            knownHashes.Clear();
-            InitializeConsensus(0);
         }
 
         private void OnRecoveryMessageReceived(ConsensusPayload payload, RecoveryMessage message)