diff --git a/src/views/trials/trials-panel/attachments/site-research/index.vue b/src/views/trials/trials-panel/attachments/site-research/index.vue
index d0592e96..b8e75f6b 100644
--- a/src/views/trials/trials-panel/attachments/site-research/index.vue
+++ b/src/views/trials/trials-panel/attachments/site-research/index.vue
@@ -389,6 +389,9 @@ export default {
         if (res.IsSuccess) {
           this.validityPeriod = res.Result.LinkExpirationTime
           this.LinkVerificationCode = res.Result.LinkVerificationCode || this.$route.query.researchProgramNo
+          if (!this.validityPeriod) {
+            this.LinkVerificationCode = null
+          }
           if (!this.validityPeriod) return false
           this.getLinkTimeIsExpired()
           this.shareLink = `${location.protocol}//${location.host}/researchLogin?trialId=${this.$route.query.trialId}`