update

src/components/studyStudent.vue

@@ -2481,7 +2481,9 @@ export default {
       }
     },
     handleClose(done) {
-      this.videoDetail.sources[0].src=''
+      if(this.videoDetail.sources&&this.videoDetail.sources[0]){
+        this.videoDetail.sources[0].src=''
+      }
       this.commentIndexJson = {};
       done();
     },