diff --git a/src/views/lecturer/OnlineLearning.vue b/src/views/lecturer/OnlineLearning.vue
index 430d6376..c164e753 100644
--- a/src/views/lecturer/OnlineLearning.vue
+++ b/src/views/lecturer/OnlineLearning.vue
@@ -63,7 +63,7 @@ export default {
     getProgress(id){
       getProgress({teacherId:id}).then(res=>{
         this.progressData=res.data
-        if (res.data.length==0 || res.data==null || res.data=='' || res.data=='null'){
+        if ( res.data==null ||res.data.length==0 || res.data=='' || res.data=='null'){
           this.disabled=true
           return
         }