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fs-service-system/src/main/java/com/fs/store/service/cache/impl/FsUserCourseCacheServiceImpl.java

@@ -32,6 +32,9 @@ public class FsUserCourseCacheServiceImpl implements IFsUserCourseCacheService {
 
     @Override
     public String selectCourseNameByCourseId(Long courseId) {
+        if(courseId == null) {
+            return "-";
+        }
         return COURSE_ID_AND_NAME.get(courseId, e-> fsUserCourseService.selectFsUserCourseByCourseId(courseId).getCourseName());
     }
 }