diff --git a/BeReadyBackend/Endpoints/Groups/PatchGroupUserProofEndpoint.cs b/BeReadyBackend/Endpoints/Groups/PatchGroupUserProofEndpoint.cs
index 8a05996..886be20 100644
--- a/BeReadyBackend/Endpoints/Groups/PatchGroupUserProofEndpoint.cs
+++ b/BeReadyBackend/Endpoints/Groups/PatchGroupUserProofEndpoint.cs
@@ -38,7 +38,7 @@ public class PatchGroupUserProofEndpoint(UserGroupsRepository userGroupsReposito
             return;
         }
 
-        if (member.Group!.IsFinished)
+        if (member.Group != null && member.Group.IsFinished)
         {
             await Send.StringAsync("Ce défi est terminé", 400, cancellation: ct);
             return;