update

edu-user/edu-user-server/src/main/java/com/keao/edu/user/service/impl/ExamSubjectSongServiceImpl.java

@@ -160,7 +160,10 @@ public class ExamSubjectSongServiceImpl extends BaseServiceImpl<Long, ExamSubjec
 						List<String> songNames=new ArrayList<>();
 						for (String s : examSubjectSongDto.getPerformSongIdList().split(",")) {
 							if(examSongIds.contains(Integer.valueOf(s))){
-								songNames.add(idExamSongMap.get(Integer.valueOf(s)).getSongName());
+								ExamSong examSong = idExamSongMap.get(Integer.valueOf(s));
+								if(Objects.nonNull(examSong)){
+									songNames.add(examSong.getSongName());
+								}
 							}
 						}
 						examSubjectSongDto.setPerformSongNames(StringUtils.join(songNames, ","));