This thread is resolved. Here is a description of the problem and solution.
Problem: If you're experiencing issues with the Ninja Forms Multilingual plugin where the PDF Form Submission extension fails to export PDFs when a form includes a checkboxlist field, this might be due to a compatibility problem between these plugins.
Additionally, subscribing to the comments on this errata page will keep you updated on when a permanent fix is rolled out.
Please note that this solution might be irrelevant if it's outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket at WPML support forum for further assistance.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.
Background of the issue:
Hi, I use the Ninja Forms plugin on my site. I also use the PDF Form Submission (hidden link) extension with Ninja Forms. But when the Ninja Forms Multilingual plugin is active, if the form I created has a checkboxlist field, the Ninja Forms- PDF Form Submission plugin does not export PDF. But when I disable Ninja Forms Multilingual extension, it exports. I ask you to fix this compatibility problem.
Symptoms:
The Ninja Forms- PDF Form Submission plugin does not export PDF when the Ninja Forms Multilingual plugin is active and the form has a checkboxlist field.
Questions:
How can I fix the compatibility problem between Ninja Forms Multilingual plugin and the PDF Form Submission extension?
Why does the PDF Form Submission plugin fail to export PDFs when the Ninja Forms Multilingual plugin is active?
I understand that deactivating Ninja Forms Multilingual plugin fixes the problem. However, can you please check by the following steps?
1) Take a full backup of your site and database before proceeding.
2) Deactivate all plugins except WPML, Ninja Forms and Ninja Forms Multilingual.
3) Switch to a standard theme like 2024 because your current theme isn't WPML compatible so we can be sure if theme isn't creating a conflict..
4) Check for the issue if it still happens.
5) Then start activating plugins one by one while keep checking for the issue. This way you 'll be able to pinpoint a conflict when & where it starts creating the problem.
Please let me know and I'll try my best to help you further on the matter.
Hi,
I followed the steps you mentioned one by one. I tried it only with Ninja Forms, Ninja Forms - PDF Form Submissions, Ninja Forms Multilingual and WPML plugin and default WordPress theme (2024). I got the following result:
If the form created with Ninja Forms contains a checkboxlist and one or both of the WPML String Translation or Ninja Forms Multilingual plugin are active, the "Ninja Forms - PDF Form Submissions" plugin does not export PDFs of form submissions. But it works if the form does not contain checkboxlist or Ninja Forms Multilingual and WPML String Translation are deactive. I think there is a conflict with Ninja Forms Multilingual and WPML String Translation with Ninja Forms - PDF Form Submissions.
Thank you for taking time to test this and providing the feedback.
I need to take a closer look at your site. So I request temporary access (WP-Admin and FTP), preferably to a test site where the problem has been replicated.
Your next answer will be private, to share this information safely.
Also provide detailed steps to reproduce the issue and links to pages in admin and on frontend.
IMPORTANT: Please take a complete backup of the site to avoid data loss. I may need to activate/deactivate plugins also.
Unfortunately, we are unable to provide you with temporary access to our website. But I have prepared a video recording that shows how the problem occurs. First, I made a clean WordPress installation. With the default 2004 theme, I used only Ninja Forms, Ninja Forms - PDF Form Submissions, Ninja Forms Multilingual, WPML Multilingual CMS and WPML String Translation plugins and I tested and recorded all the stages that show the problem one by one. In the same way, you can test it as in the video by installing WordPress and the plugins I mentioned. You can access the video from the link below: hidden link
Thank you for the video, I can see the steps you performed and can see the issue indeed.
Almost at end of the video when the issue happens, this is showing a 500 Internal Server Error. This means there's something crashing the process.
Can you enable debugging in your site? See https://wpml.org/documentation/support/debugging-wpml/ for details. Then reproduce the error so it is logged in the debug.log. And then please take the error detail from the log and share with me.
If you don't find the error in debug.log, you should look into PHP and/or Server error logs.
Alternatively you can also try this plugin https://wordpress.org/plugins/debug-log-manager/ and activate it. This logs real time errors. You can then find it in WordPress -> Tools menu and can get the error details.
There is no error log about this in the debug.log file. Also I looked server and php errors. Only 500 error appears on the server side but no other information (2024-08-08 16:59:08 Error 500 POST /test/tr/wp-json/ninja-forms-submissions/submissions/handle-extra?_locale=user HTTP/1.0). I copied the 500 error that appears in the video from the browser console and pasted it below.
If you try it yourself by making a simple installation as I did in the video, you can see the problem.
api-fetch.min.js?ver=4c185334c5ec26e149cc:2 POST /test/wp-json/ninja-forms-submissions/submissions/handle-extra?_locale=user 500 (Internal Server Error)
O @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
h @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
P @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
o @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
P.method.r @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
o @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
t @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
g @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
t @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
t @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
j @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
nt @ submissions.js?ver=c49c4ddfafe43d751a79:1
onClick @ submissions.js?ver=c49c4ddfafe43d751a79:1
n.<computed> @ components.min.js?ver=36b97398bf090476214e:27
De @ react-dom.min.js?ver=18.3.1:2
Be @ react-dom.min.js?ver=18.3.1:2
(anonymous) @ react-dom.min.js?ver=18.3.1:2
Ir @ react-dom.min.js?ver=18.3.1:2
Ur @ react-dom.min.js?ver=18.3.1:2
(anonymous) @ react-dom.min.js?ver=18.3.1:2
ss @ react-dom.min.js?ver=18.3.1:2
Le @ react-dom.min.js?ver=18.3.1:2
Qr @ react-dom.min.js?ver=18.3.1:2
qn @ react-dom.min.js?ver=18.3.1:2
$n @ react-dom.min.js?ver=18.3.1:2
submissions.js?ver=c49c4ddfafe43d751a79:1 HandleExtra cancelled: <p>There has been a critical error on this website.</p><p>Learn more about troubleshooting WordPress.</p>
api-fetch.min.js?ver=4c185334c5ec26e149cc:2 Fetch failed loading: POST "/test/wp-json/ninja-forms-submissions/submissions/handle-extra?_locale=user".
O @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
h @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
P @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
o @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
P.method.r @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
o @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
t @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
g @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
t @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
t @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
(anonymous) @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
j @ api-fetch.min.js?ver=4c185334c5ec26e149cc:2
nt @ submissions.js?ver=c49c4ddfafe43d751a79:1
onClick @ submissions.js?ver=c49c4ddfafe43d751a79:1
n.<computed> @ components.min.js?ver=36b97398bf090476214e:27
De @ react-dom.min.js?ver=18.3.1:2
Be @ react-dom.min.js?ver=18.3.1:2
(anonymous) @ react-dom.min.js?ver=18.3.1:2
Ir @ react-dom.min.js?ver=18.3.1:2
Ur @ react-dom.min.js?ver=18.3.1:2
(anonymous) @ react-dom.min.js?ver=18.3.1:2
ss @ react-dom.min.js?ver=18.3.1:2
Le @ react-dom.min.js?ver=18.3.1:2
Qr @ react-dom.min.js?ver=18.3.1:2
qn @ react-dom.min.js?ver=18.3.1:2
$n @ react-dom.min.js?ver=18.3.1:2
