diff --git a/src/main/java/com/example/reddiserver/auth/service/OAuthService.java b/src/main/java/com/example/reddiserver/auth/service/OAuthService.java
index 15eaff0..fc8c590 100644
--- a/src/main/java/com/example/reddiserver/auth/service/OAuthService.java
+++ b/src/main/java/com/example/reddiserver/auth/service/OAuthService.java
@@ -80,9 +80,13 @@ public LoginResponseDto login(String code, String redirectUri) {
 
 	public Long getUserId() {
 		Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+
 		if (authentication != null) {
-			CustomAuthenticationDetails customDetails = (CustomAuthenticationDetails) authentication.getDetails();
-			return customDetails.getUserId();
+			Object details = authentication.getDetails();
+			if (details instanceof CustomAuthenticationDetails) {
+				CustomAuthenticationDetails customDetails = (CustomAuthenticationDetails) details;
+				return customDetails.getUserId();
+			}
 		}
 
 		return null; // 인증 정보가 없거나 CustomAuthenticationDetails를 사용하지 않는 경우
diff --git a/src/main/java/com/example/reddiserver/controller/ChatGptController.java b/src/main/java/com/example/reddiserver/controller/ChatGptController.java
index e736fb1..9a3a835 100644
--- a/src/main/java/com/example/reddiserver/controller/ChatGptController.java
+++ b/src/main/java/com/example/reddiserver/controller/ChatGptController.java
@@ -23,7 +23,6 @@ public class ChatGptController {
     private final ChatGptService chatGptService;
     private final OAuthService oAuthService;
 
-    @SecurityRequirement(name = "Authorization")
     @Operation(summary = "ChatGPT로 원하는 브랜드 만들기")
     @PostMapping("/question")
     public ApiResponse<ChatGptCreationResultDto> postChat(@RequestBody ChatGptRequest chatGptRequest) throws JsonProcessingException {