Submit form stuck at “please wait”

[ggrey]

Hi everyone, updated to the latest version and noticed the form is sent, and all records updated but it hangs on PLEASE WAIT and won’t show redirect URL. And so, forms are resubmitted because users think there has been a problem sending. Tired both embedded and self hosted with same result.

here is the URL

Registrazione socio – AS Roma Club Londra | Lupi di Londra

Can’t confirm this, but it seems problem started after the lates upgrade from 5.2.3
Found similar topics but they referred to 10 years old posts.

[ricfreire]

Hiya @ggrey

I tried submitting the form, but the browser console shows an 500 Internal Server Error.

Here’s what you can try:

1. Go to your Mautic instance and open the form. Fill it in and test if it works. If it does, great. If not, it’s likely a Mautic-related issue.

2. On your WordPress site, activate Elementor’s Safe Mode and check if the form works there. Don’t forget to monitor the browser console for errors.

Also, could you let me know which Mautic version you’re using? And if you’re running any additional tools or plugins we should be aware of?

Best regards,
Ricardo

[ggrey]

Hi Ricardo, thanks for your quick reply. I have run form from the instance and it throws an error 500 as well. Version is the latest, 6.0.5. We have Zapier plugin but on that side, since the upgrade, zaps are failing showing authentication expired, and on updates they show 500 error as well. Same with N8N so cannot authenticate.

PS. just checked the logs now while looking for the various versions, and found this

[2025-09-15T08:37:07.054478+00:00] mautic.CRITICAL: Uncaught PHP Exception InvalidArgumentException: “The directory “/var/www/html/var/cache/prod/jms_serializer_default” is not writable.” at /var/www/html/vendor/jms/metadata/src/Cache/FileCache.php line 49 {“exception”:“[object] (InvalidArgumentException(code: 0): The directory \”/var/www/html/var/cache/prod/jms_serializer_default\" is not writable. at /var/www/html/vendor/jms/metadata/src/Cache/FileCache.php:49)"} {“hostname”:“LDLmautic5”,“pid”:21193}

so run

sudo chown -R www-data:www-data /var/www/html/var/cache
sudo chown -R www-data:www-data /var/www/html/var/logs
sudo chown -R www-data:www-data /var/www/html/media

then

sudo chmod -R 775 /var/www/html/var/cache
sudo chmod -R 775 /var/www/html/var/logs
sudo chmod -R 775 /var/www/html/media

and finally cleared cache again

cd /var/www/html
sudo -u www-data php bin/console cache:clear --env=prod

Now the problem is gone. That also solved the Zappier authentication. Hope this helps others with same issue. Keep up the good work