diff --git a/BeReadyBackend/Endpoints/RandomChallenges/PatchProofEndpoint.cs b/BeReadyBackend/Endpoints/RandomChallenges/PatchProofEndpoint.cs
index 5c9e9a6..06cf8fe 100644
--- a/BeReadyBackend/Endpoints/RandomChallenges/PatchProofEndpoint.cs
+++ b/BeReadyBackend/Endpoints/RandomChallenges/PatchProofEndpoint.cs
@@ -77,11 +77,11 @@ public class PatchProofEndpoint(
 
         userRandomChallenge.Proof = Convert.ToBase64String(proofBytes);
 
-        user.TotalChallenge++; // +1 challenge de fait
+        user.TotalChallenge++;
 
         UserRandomChallenge? lastChallenge = await userRandomChallengesRepository.SingleOrDefaultAsync(new GetLastRandomChallengeSpec(userId), ct);
         
-        if (lastChallenge is not null) user.Series++;
+        if (lastChallenge is not null || user.Series == 0) user.Series++;
         else user.Series = 1;
 
         await usersRepository.SaveChangesAsync(ct);