get blank form after click submit, no data goes to database

Hi,
I have a 'live' site and 'test' site with different url. Before I have those 2 versions, I only work on the test one. When I am ready to make it live, I just clone to another copy. The second copy that I intend to use as a test site start to behave unusual which I never seen this before.
When I click submit a form, the form has been submitted but it returned a blank form instead of a thank you message. It did not tell me either client side validation error or server side validation error, just a blank form that has been submitted and no data insert into a database. I have a debugger on, but it did not help to see anything. When I turn the error reporting on, it crashed the site. I got the page is not available on both front-end and back-end, grey blank page. So, I do know know how to find the cause of this issue.
Please advise.
Thank you,
Nilubon

Hello nilubon03,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
My form data isn't saving to the database correctly
My CFv5 form data isn't saving to the database correctly
How do I save form data to a database table?
How to load record data from a database table into your form
P.S: I'm just an automated service😉

No, it did not help.
Thank you,
M

Hello nilubon03,

Please test your form using the "View form" link in the forms manager, does it behave the same way ?

Regards,
Max

Hi Max,

Thank you for your suggestion. I used "View form" link in the forms manager, and I can submit the form. Can you point me out where to check next?

Thank you,

Nilubon

It worked.

Thanks Max. I appreciate your time.

Hi Nilubon,

Please see this FAQ - that should be more useful

Bob

Thank you Bob,
What I got was a blank form, not a blank page. I will keep in mind if I get a blank page, I will follow that instruction on that FAQ.

Thank you,
Nilubon