Getting 500 error when moving through pages

I have a study with about 10 pages, and o page 3 when I click next it does not work.
In the edit mode works, also in the prefill mode works, only when I publish the form it does not work.

https://api.opnform.com/forms/studiu-de-caz-management-clinica-medicala-ahfzks/answer

Request Method

POST

Status Code

500 Internal Server Error

Response

{ "message": "Server Error" }

x-amzn-requestid: 1b7cc8df-2e96-48d5-818c-770c793de8a1