diff --git a/purithm/src/main/java/com/example/purithm/domain/user/service/UserService.java b/purithm/src/main/java/com/example/purithm/domain/user/service/UserService.java
index 2c89daa..a640229 100644
--- a/purithm/src/main/java/com/example/purithm/domain/user/service/UserService.java
+++ b/purithm/src/main/java/com/example/purithm/domain/user/service/UserService.java
@@ -17,6 +17,7 @@
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
+import org.springframework.dao.DuplicateKeyException;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 
@@ -58,8 +59,14 @@ public Long signUp(SignUpUserInfoDto signUpUserInfoDto) {
         .deletedAt(null)
         .build();
 
-    User savedUser = userRepository.save(user);
-    return savedUser.getId();
+    Long savedUserId = null;
+    try {
+      User savedUser = userRepository.save(user);
+      savedUserId = savedUser.getId();
+    } catch (DuplicateKeyException e) {
+      throw new RuntimeException("try to save duplicated user");
+    }
+    return savedUserId;
   }
 
   public void agreeToTermsOfUse(Long id) {