diff --git a/Lib9c.Policy/NCStagePolicy.cs b/Lib9c.Policy/NCStagePolicy.cs
index d14b9eefee..13b77bdf60 100644
--- a/Lib9c.Policy/NCStagePolicy.cs
+++ b/Lib9c.Policy/NCStagePolicy.cs
@@ -90,14 +90,7 @@ public bool Stage(BlockChain blockChain, Transaction transaction)
         {
             if (_accessControlService?.GetTxQuota(transaction.Signer) is { } acsTxQuota)
             {
-                if (_quotaPerSignerList.ContainsKey(transaction.Signer))
-                {
-                    _quotaPerSignerList[transaction.Signer] = acsTxQuota;
-                }
-                else
-                {
-                    _quotaPerSignerList.TryAdd(transaction.Signer, acsTxQuota);
-                }
+                _quotaPerSignerList[transaction.Signer] = acsTxQuota;
 
                 if (acsTxQuota == 0)
                 {