nits

Author: angelayu0530

src/main/java/com/patina/codebloom/api/duel/DuelController.java

@@ -87,7 +87,7 @@ public ResponseEntity<ApiResponder<Empty>> createParty(final HttpServletRequest
 
         AuthenticationObject authenticationObject = protector.validateSession(request);
         User user = authenticationObject.getUser();
-        String playerId = authenticationObject.getUser().getId();
+        String playerId = user.getId();
 
         LobbyPlayer existingLobbyPlayer = lobbyPlayerRepository.findLobbyPlayerByPlayerId(playerId);
         if (existingLobbyPlayer != null) {