diff --git a/src/views/trials/trials-panel/trial-summary/audit-record/index.vue b/src/views/trials/trials-panel/trial-summary/audit-record/index.vue
index 19840b87..492b6bfd 100644
--- a/src/views/trials/trials-panel/trial-summary/audit-record/index.vue
+++ b/src/views/trials/trials-panel/trial-summary/audit-record/index.vue
@@ -721,7 +721,7 @@ export default {
   },
   methods: {
     isFile(str) {
-      return !!~str.indexOf('❄❅❆❇❈❉❊')
+      return str && Object.prototype.toString.call(str) === "[object String]" && !!~str.indexOf('❄❅❆❇❈❉❊')
     },
     async download(str) {
       str = str.replace("❄❅❆❇❈❉❊", '')