JForm recaptcha generates timeout-or-duplicate after successful send of form

[mjb021]

It may be my installation (Joomla 3.85, php7, mysqli 5.6.36) but after the last upgrade I noticed that after the form is sent successfully (and I do not redirect to another page), it reloads the from with empy fields but then shows the error: "timeout-or-duplicate" - Error: Unable to Submit Form.
This is of course very confusing for the end-user. I now manually filtered out that message so my end-users are not bothered, but it does seem to be an issue.
Note: (See subject) form type is set to JForm.
Any ideas if it's something I did wrong or an issue with the code?
Mark

[andrewscaya]

Hi @mjb021,

Which CAPTCHA module are you using?

[mjb021]

I'm using jForm so the installed default captcha is the (google) recaptcha that's provided in Joomla

[andrewscaya]

OK. Will try to reproduce your issue.

[andrewscaya]

@mjb021 --

I have not been able to reproduce this issue when using PHP 7.2.5 and Joomla 3.8.7 with the captcha/recaptcha plugin 2.0.

I know that Google modified the way they validate the captcha submissions lately. Two subsequent requests to validate the same captcha is now considered to be invalid and will return the 'timeout-or-duplicate' error. Many other projects have had this same issue (ex. this project). Since I am unable to reproduce the issue with a recent version of Joomla, I suspect that Joomla has already fixed this issue.

Anyway, this issue is not ours to fix, since it is not part of our code base. Our only recommendation would therefore be to update your version of Joomla to the latest version.

Thank you for your interest in the Simple Email Form module!

Best regards,

Andrew