diff --git a/servers/boe-server-all/src/main/java/com/xboe/module/course/service/impl/CourseServiceImpl.java b/servers/boe-server-all/src/main/java/com/xboe/module/course/service/impl/CourseServiceImpl.java
index 2592059c..3b720ecd 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/module/course/service/impl/CourseServiceImpl.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/module/course/service/impl/CourseServiceImpl.java
@@ -980,6 +980,9 @@ public class CourseServiceImpl implements ICourseService {
 			for (Object o:list) {
 				strings.add((String) o);
 			}
+			if(list.isEmpty()){
+				return courses;
+			}
 			QueryBuilder builder = QueryBuilder.from(Course.class);
 			builder.addFilter(FieldFilters.eq("deleted",false));
 			builder.addFilter(FieldFilters.eq("enabled",true));