diff --git a/src/DAO/MemoryAuthDAO.cpp b/src/DAO/MemoryAuthDAO.cpp
index 8c9d71f..3b5561a 100644
--- a/src/DAO/MemoryAuthDAO.cpp
+++ b/src/DAO/MemoryAuthDAO.cpp
@@ -27,10 +27,10 @@ bool MemoryAuthDAO::HasAuthorized(const std::string& auth_token)
 
 bool MemoryAuthDAO::Logout(const std::string& auth_token)
 {
-  string user_uuid = auth_tokens_to_users_uuids_[auth_token];
-
   if (!HasAuthorized(auth_token)) return false;
 
+  string user_uuid = auth_tokens_to_users_uuids_[auth_token];
+
   users_uuids_to_auth_tokens_.erase(user_uuid);
   auth_tokens_to_users_uuids_.erase(auth_token);