Registsratio form error 500

Hi,
I updated Joomla 6.0.3 and the registration form no longer works: I get an error 500.
Can you help me?
Best regards
Emilio

Enable debug mode and maximum error reporting in Joomla global configuration then retry and provide the full error output.

Not sure this is the same issue, but my site is on J!5.4.3, CB 2.11.0+build.2026.01.12.21.55.56.a25ef0f6c. The most recent person to register went to click the link in the confirmation email sent to him and that produced the following call stack.

0 implode(): Argument #1 ($array) must be of type array, string given

Call Stack
#    Function    Location
1    ()    JROOT/components/com_comprofiler/comprofiler.php:1410
2    implode()    JROOT/components/com_comprofiler/comprofiler.php:1410
3    confirm()    JROOT/components/com_comprofiler/comprofiler.php:157
4    require_once()    JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71
5    Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}()    JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:73
6    Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch()    JROOT/libraries/src/Component/ComponentHelper.php:361
7    Joomla\CMS\Component\ComponentHelper::renderComponent()    JROOT/libraries/src/Application/SiteApplication.php:217
8    Joomla\CMS\Application\SiteApplication->dispatch()    JROOT/libraries/src/Application/SiteApplication.php:271
9    Joomla\CMS\Application\SiteApplication->doExecute()    JROOT/libraries/src/Application/CMSApplication.php:304
10    Joomla\CMS\Application\CMSApplication->execute()    JROOT/includes/app.php:58
11    require_once()    JROOT/index.php:51

EDIT: I added a debug output to show print_r($messagesToUser,true) and it was empty. So, under what circumstances would that variable be empty? Curious, because the new user forwarded me his email and I opened the confirmation link AFTER I approved and activated his account manually. I did not open the link before doing that. Thought this might be significant info. That said, this should still be protected against since it is definitely a possible situation.

Don't think this is the same issue as the original poster.

$messagesToUser can be NULL or array. The NULL is probably the cause. There shouldn't be a case where there is no confirmation message though. Did you translate the confirmation message to empty string? At any rate will add a bug ticket and a fix for this.

forge.joomlapolis.com/issues/9825

No, but like I said, I had already enabled his account before he finally dug the email out of his spam folder and clicked it (and before I retested it). So by the time the link was clicked, the account had already been approved and enabled. It is, however, still not "confirmed". So I thought the link should work.

Ok, thank you. I have a fix pending for review and merge that will skip the implode if $messagesToUser is NULL or empty. That'll prevent that error.