diff --git a/src/main/java/com/yipin/liuwanr/service/ExperimentallearningService.java b/src/main/java/com/yipin/liuwanr/service/ExperimentallearningService.java
index 60ad02e..dc0a72d 100644
--- a/src/main/java/com/yipin/liuwanr/service/ExperimentallearningService.java
+++ b/src/main/java/com/yipin/liuwanr/service/ExperimentallearningService.java
@@ -143,7 +143,7 @@ public class ExperimentallearningService {
 		HashMap<String, Object> resp = new HashMap<String, Object>();
 		HashMap<String, Object> val = new HashMap<String, Object>();
 		try {
-			List<Assesment> assesments=null;
+			List<Assesment> assesments=new ArrayList<>();
 			if(!StringUtils.isEmpty(courseId)) {
 				assesments = mapper.queryAssesment(courseId);
 			}