diff --git a/SVSim.EmulatedEntrypoint/Services/GachaPointService.cs b/SVSim.EmulatedEntrypoint/Services/GachaPointService.cs
index 9ab0eb4..a8a07df 100644
--- a/SVSim.EmulatedEntrypoint/Services/GachaPointService.cs
+++ b/SVSim.EmulatedEntrypoint/Services/GachaPointService.cs
@@ -160,8 +160,7 @@ public sealed class GachaPointService : IGachaPointService
 
         int threshold = pack.GachaPointConfig.ExchangeablePoint;
         var balance = viewer.GachaPointBalances.FirstOrDefault(b => b.PackId == packId);
-        int currentPoints = balance?.Points ?? 0;
-        if (currentPoints < threshold)
+        if (balance is null || balance.Points < threshold)
             return ExchangeOutcome.Fail("insufficient_gacha_points");
 
         // Validate the card is in the catalog by re-running GetRewardsAsync. This re-uses the
@@ -176,8 +175,8 @@ public sealed class GachaPointService : IGachaPointService
         if (viewer.GachaPointReceived.Any(r => r.PackId == packId && r.CardId == cardId))
             return ExchangeOutcome.Fail("already_received");
 
-        // Debit balance + mark received.
-        balance!.Points -= threshold;
+        // Debit balance + mark received. (`balance` is non-null past the earlier guard.)
+        balance.Points -= threshold;
         viewer.GachaPointReceived.Add(new ViewerGachaPointReceived
         {
             PackId = packId, CardId = cardId, ReceivedAt = DateTime.UtcNow,