diff --git a/src/main/java/Ness/Backend/domain/member/MemberService.java b/src/main/java/Ness/Backend/domain/member/MemberService.java
index 79cb774..400b746 100644
--- a/src/main/java/Ness/Backend/domain/member/MemberService.java
+++ b/src/main/java/Ness/Backend/domain/member/MemberService.java
@@ -71,7 +71,7 @@ public void createMember(String email, String password, String picture, String n
         //핑크
         Category restCategory = Category.builder()
                 .member(member)
-                .name("\uD83D\uDEDF여가")
+                .name("✨여가")
                 .color("#FF75C8")
                 .build();
 
diff --git a/src/main/java/Ness/Backend/domain/schedule/ScheduleService.java b/src/main/java/Ness/Backend/domain/schedule/ScheduleService.java
index 209c84c..1313937 100644
--- a/src/main/java/Ness/Backend/domain/schedule/ScheduleService.java
+++ b/src/main/java/Ness/Backend/domain/schedule/ScheduleService.java
@@ -14,6 +14,7 @@
 import Ness.Backend.domain.schedule.dto.response.GetScheduleDto;
 import Ness.Backend.domain.schedule.dto.response.GetScheduleListDto;
 import Ness.Backend.domain.schedule.entity.Schedule;
+import Ness.Backend.global.error.exception.NotFoundCategoryException;
 import Ness.Backend.global.fastApi.FastApiDeleteScheduleApi;
 import Ness.Backend.global.fastApi.FastApiPostScheduleApi;
 import Ness.Backend.global.fastApi.FastApiPutScheduleApi;
@@ -137,25 +138,30 @@ public GetChatListDto postAiScheduleAccept(Long memberId, Boolean idAccepted, Lo
         Member member = memberRepository.findMemberById(memberId);
         Category category = categoryRepository.findCategoryById(postScheduleDto.getCategoryNum());
 
+        /* 사용자가 Accept 했으면 스케쥴 생성하기 */
         if(idAccepted){
-            /* 사용자가 Accept 했으면 스케쥴 생성하기 */
-            Chat chat = chatRepository.findChatById(chatId);
-
-            Schedule newSchedule = Schedule.builder()
-                    .info(postScheduleDto.getInfo())
-                    .location(postScheduleDto.getLocation())
-                    .person(postScheduleDto.getPerson())
-                    .startTime(postScheduleDto.getStartTime())
-                    .endTime(postScheduleDto.getEndTime())
-                    .member(member)
-                    .category(category)
-                    .chat(chat)
-                    .build();
-
-            scheduleRepository.save(newSchedule);
-
-            chatService.createNewChat("일정을 추가해드렸습니다:)", ChatType.AI, 1, member);
-
+            /* 카테고리 연견관계가 정상적인 경우*/
+            if(category != null){
+                Chat chat = chatRepository.findChatById(chatId);
+
+                Schedule newSchedule = Schedule.builder()
+                        .info(postScheduleDto.getInfo())
+                        .location(postScheduleDto.getLocation())
+                        .person(postScheduleDto.getPerson())
+                        .startTime(postScheduleDto.getStartTime())
+                        .endTime(postScheduleDto.getEndTime())
+                        .member(member)
+                        .category(category)
+                        .chat(chat)
+                        .build();
+
+                scheduleRepository.save(newSchedule);
+
+                chatService.createNewChat("일정을 추가해드렸습니다:)", ChatType.AI, 1, member);
+            }
+            else{
+                throw new NotFoundCategoryException();
+            }
         } else {
             chatService.createNewChat("일정 추가를 취소했습니다.\n더 필요한 것이 있으시면 알려주세요!", ChatType.AI, 1, member);
         }
diff --git a/src/main/java/Ness/Backend/global/error/ErrorCode.java b/src/main/java/Ness/Backend/global/error/ErrorCode.java
index 9b86c74..3d4aafa 100644
--- a/src/main/java/Ness/Backend/global/error/ErrorCode.java
+++ b/src/main/java/Ness/Backend/global/error/ErrorCode.java
@@ -35,6 +35,7 @@ public enum ErrorCode {
     /* 카테고리 관련 */
     INVALID_CATEGORY_NAME(CONFLICT, "CATE001", "해당 카테고리명이 이미 존재합니다. 카테고리명은 중복될 수 없습니다."),
     INVALID_CATEGORY_DELETE(BAD_REQUEST, "CATE002", "미분류 카테고리는 삭제 불가능합니다."),
+    NOTFOUND_CATEGORY(BAD_REQUEST, "CATE003", "해당 카테고리가 해당 맴버에게 존재하지 않습니다."),
 
     /* 리포트 관련 */
     MISMATCH_REPORT_RECOMMEND(BAD_REQUEST, "RPT001", "한 줄 추천이 존재하지 않습니다.");
diff --git a/src/main/java/Ness/Backend/global/error/exception/NotFoundCategoryException.java b/src/main/java/Ness/Backend/global/error/exception/NotFoundCategoryException.java
new file mode 100644
index 0000000..c65f97f
--- /dev/null
+++ b/src/main/java/Ness/Backend/global/error/exception/NotFoundCategoryException.java
@@ -0,0 +1,16 @@
+package Ness.Backend.global.error.exception;
+
+import Ness.Backend.global.error.ErrorCode;
+import lombok.Getter;
+@Getter
+public class NotFoundCategoryException extends BaseException {
+    public NotFoundCategoryException() {
+        super(ErrorCode.NOTFOUND_CATEGORY, ErrorCode.NOTFOUND_CATEGORY.getMessage());
+    }
+    public NotFoundCategoryException(String message) {
+        super(ErrorCode.NOTFOUND_CATEGORY, message);
+    }
+    public NotFoundCategoryException(ErrorCode errorCode) {
+        super(errorCode, errorCode.getMessage());
+    }
+}