diff --git a/src/main/java/com/example/likelion12/service/MemberService.java b/src/main/java/com/example/likelion12/service/MemberService.java
index 23bd9e0..9a87ace 100644
--- a/src/main/java/com/example/likelion12/service/MemberService.java
+++ b/src/main/java/com/example/likelion12/service/MemberService.java
@@ -70,7 +70,7 @@ public Long signOut(Long memberId) {
         log.info("[MemberService.deleteMember] memberId: {}", memberId);
 
         // 회원을 찾고
-        Member member = memberRepository.findById(memberId).orElse(null);
+        Member member = memberRepository.findById(memberId).orElseThrow(()-> new MemberException(CANNOT_FOUND_MEMBER));
 
         // 회원 상태를 Delete 변경하고
         member.setStatus(BaseStatus.DELETE);