Github user doanduyhai commented on the issue:
https://github.com/apache/zeppelin/pull/1369
Let me investigate the root cause, it should be some Javascript subtle bug --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
