diff --git a/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CourseFullTextApi.java b/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CourseFullTextApi.java
index 7eb15d5d..d7c6fdf1 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CourseFullTextApi.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CourseFullTextApi.java
@@ -3,6 +3,7 @@ package com.xboe.module.course.api;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import com.xboe.api.ThirdApi;
@@ -220,7 +221,10 @@ public class CourseFullTextApi  extends ApiBaseController{
 			token = request.getHeader("token");
 		}
 		List<String> offCourseId = thirdApi.getOffCourseId(dto.getUserId(),token);
-		String offCourseIds = String.join(",", offCourseId);
+		String offCourseIds = "";
+		if (!Objects.isNull(offCourseId) && offCourseId.size() > 0){
+			offCourseIds = String.join(",", offCourseId);
+		}
 //		String offCourseIds="123.311";
 		//根据userId查询报名的课程
 		List<String>courseId=IStudyCourseService.getCourseId(dto.getUserId());