diff --git a/src/components/Course/homework.vue b/src/components/Course/homework.vue
index 6f3912e9..f5f12a71 100644
--- a/src/components/Course/homework.vue
+++ b/src/components/Course/homework.vue
@@ -109,7 +109,7 @@ export default {
          if(res.status==200){
              this.info=res.result;
              //检查是否过期
-            if(res.result.deadTime!=''){
+            if(res.result.deadTime!='' && res.result.deadTime != null){
                var d = new Date(res.result.deadTime);
                var now=new Date();
                if(now.getTime() > d.getTime()){