Fix challenge crash

My project/Assets/ScienceStreet/Features/Challenge/ChallengeManager.cs

@@ -37,6 +37,10 @@ public class ChallengeManager : MonoBehaviour
     private float _lastGameTimeLeft = 0f;
     public float LastGameTimeLeft => _lastGameTimeLeft;
 
+    // ✅ NEW: prevent double-start
+    private bool _challengeRunning = false;
+    public bool IsChallengeRunning => _challengeRunning;
+
     // ─── Singleton ────────────────────────────────────────────────────────
     private void Awake()
     {
@@ -71,6 +75,9 @@ public class ChallengeManager : MonoBehaviour
     // ─── Challenge flow ───────────────────────────────────────────────────
     public async UniTask StartChallenge()
     {
+        if (_challengeRunning) return; // prevent double-start
+        _challengeRunning = true;
+
         startTime = DateTime.UtcNow;
         currentGameIndex = 0;
         timeSaved = 0;
@@ -83,20 +90,16 @@ public class ChallengeManager : MonoBehaviour
 
     private void OnGameCompleted(bool hasWon, float timeLeft, float pointsEarned)
     {
-        print("Game completed");
         if (currentGame != null)
             currentGame.OnGameCompleted -= OnGameCompleted;
 
         if (!hasWon)
         {
-            LostChallenge();
+            LostChallenge().Forget();
             return;
         }
 
-        // ✅ NEW: store timeLeft so the next game can use it as a bonus
         _lastGameTimeLeft = timeLeft;
-
-        // Add time left to total saved time
         timeSaved += Mathf.RoundToInt(timeLeft);
 
         currentGameIndex++;
@@ -139,16 +142,19 @@ public class ChallengeManager : MonoBehaviour
 
     private async UniTask LostChallenge()
     {
-        Debug.Log("Challenge failed.");
-        challengeCanvas.ShowChallengeResult(
-            false, 0, penaltiesPerGame[currentGameIndex]);
+        _challengeRunning = false;
+        int maxPenalty = penaltiesPerGame[currentGameIndex];
+        int currentPoints = UserService.Instance.CurrentUser?.Points ?? 0;
+        int actualPenalty = Mathf.Min(maxPenalty, currentPoints);
+
+        challengeCanvas.ShowChallengeResult(false, 0, actualPenalty);
         await ChallengeService.Instance.AddChallenge(
-            false, 0, -penaltiesPerGame[currentGameIndex], startTime, DateTime.UtcNow);
+            false, 0, -actualPenalty, startTime, DateTime.UtcNow);
     }
 
     private async UniTask WonChallenge(int timeSaved, int pointsEarned)
     {
-        Debug.Log("Challenge completed! Total time saved: " + timeSaved);
+        _challengeRunning = false;
         challengeCanvas.ShowChallengeResult(true, timeSaved, pointsEarned);
         await ChallengeService.Instance.AddChallenge(
             true, timeSaved, pointsEarned, startTime, DateTime.UtcNow);