diff --git a/Lib9c/Delegation/Delegatee.cs b/Lib9c/Delegation/Delegatee.cs
index 29c589c722..124f951268 100644
--- a/Lib9c/Delegation/Delegatee.cs
+++ b/Lib9c/Delegation/Delegatee.cs
@@ -565,7 +565,11 @@ record = Repository.GetLumpSumRewardsRecord(this, lastStartHeight)
                 rewardBase = rewardBase.AddRewards(recordEach.LumpSumRewards.Values);
                 foreach (var r in recordEach.LumpSumRewards)
                 {
-                    Repository.TransferAsset(recordEach.Address, DistributionPoolAddress(), Repository.GetBalance(recordEach.Address, r.Key));
+                    var toTransfer = Repository.GetBalance(recordEach.Address, r.Key);
+                    if (toTransfer.Sign > 0)
+                    {
+                        Repository.TransferAsset(recordEach.Address, DistributionPoolAddress(), toTransfer);
+                    }
                 }
 
                 Repository.RemoveLumpSumRewardsRecord(recordEach);