diff --git a/src/main/java/ssu/eatssu/domain/auth/entity/SystemAppleAuthenticator.java b/src/main/java/ssu/eatssu/domain/auth/entity/SystemAppleAuthenticator.java
index 904c99b6..b560e71c 100644
--- a/src/main/java/ssu/eatssu/domain/auth/entity/SystemAppleAuthenticator.java
+++ b/src/main/java/ssu/eatssu/domain/auth/entity/SystemAppleAuthenticator.java
@@ -25,7 +25,7 @@
 import java.util.Base64;
 import java.util.Map;
 
-import static ssu.eatssu.global.handler.response.BaseResponseStatus.INVALID_IDENTITY_TOKEN;
+import static ssu.eatssu.global.handler.response.BaseResponseStatus.*;
 
 @Component
 @RequiredArgsConstructor
@@ -49,10 +49,19 @@ private OAuthInfo getOAuthInfoByPublicKey(String identityToken, PublicKey public
                             .parseClaimsJws(identityToken)
                             .getBody();
 
-        //Claims 에서 email, providerId(사용자 식별값) 를 추출한다.
+        Object emailObj = claims.get("email");
+        Object providerIdObj = claims.get("sub");
+
+        if (providerIdObj == null) {
+            throw new BaseException(NOT_FOUND_PROVIDER_ID);
+        }
+        if (emailObj == null) {
+            throw new BaseException(NOT_FOUND_EMAIL);
+        }
+
         try {
-            String email = claims.get("email").toString();
-            String providerId = claims.get("sub").toString();
+            String email = emailObj.toString();
+            String providerId = providerIdObj.toString();
             return new OAuthInfo(email, providerId);
         } catch (ExpiredJwtException exception) {
             throw new BaseException(INVALID_IDENTITY_TOKEN);
diff --git a/src/main/java/ssu/eatssu/domain/user/entity/User.java b/src/main/java/ssu/eatssu/domain/user/entity/User.java
index 5dc57fc0..10135982 100644
--- a/src/main/java/ssu/eatssu/domain/user/entity/User.java
+++ b/src/main/java/ssu/eatssu/domain/user/entity/User.java
@@ -49,7 +49,6 @@ public class User extends BaseTimeEntity {
     private Long id;
     @Enumerated(EnumType.STRING)
     private Role role;
-    @Column(unique = true)
     private String email;
     private String nickname;
     @Enumerated(EnumType.STRING)
diff --git a/src/main/java/ssu/eatssu/global/handler/response/BaseResponseStatus.java b/src/main/java/ssu/eatssu/global/handler/response/BaseResponseStatus.java
index 6009d49f..4189568e 100644
--- a/src/main/java/ssu/eatssu/global/handler/response/BaseResponseStatus.java
+++ b/src/main/java/ssu/eatssu/global/handler/response/BaseResponseStatus.java
@@ -75,6 +75,8 @@ public enum BaseResponseStatus {
     NOT_FOUND_PARTNERSHIP(false, HttpStatus.NOT_FOUND, 40410, "해당 제휴를 찾을 수 없습니다."),
     NOT_FOUND_PARTNERSHIP_RESTAURANT(false, HttpStatus.NOT_FOUND, 40411, "해당 제휴 식당을 찾을 수 없습니다."),
     INVALID_NICKNAME(false, HttpStatus.NOT_FOUND, 40412, "잘못된 닉네임입니다."),
+    NOT_FOUND_PROVIDER_ID(false, HttpStatus.NOT_FOUND, 40413, "Claims에서 ProviderId(sub)를 찾을 수 없습니다."),
+    NOT_FOUND_EMAIL(false, HttpStatus.NOT_FOUND, 40414, "Claims에서 이메일을 찾을 수 없습니다."),
 
     /**
      * 405 METHOD_NOT_ALLOWED 지원하지 않은 method 호출