Error. 0 PlgSystemHelixultimate::onContentBeforeSave(): Argument https://github.com/jmcameron/attachments/pull/3 ($isNew) must be of type bool, null given, called in /.../libraries/src/Plugin/CMSPlugin.php on line 289

[bsylwek]

Attachements Cameron version 4.2.0 https://extensions.joomla.org/extension/attachments/
Joomla 4.4.14 Helix Ultimate plugin version 2.2.3

When I try to add an attachment to an article, I get this error. Is it related to the Helix Framework plugin and template? I have the latest version of PHP 8.1.10

Error. 0 PlgSystemHelixultimate::onContentBeforeSave(): Argument jmcameron/attachments#3 ($isNew) must be of type bool, null given, called in /.../libraries/src/Plugin/CMSPlugin.php on line 289

How can I fix this? I won't disable the template add-on because it won't work either.

Expected result

Actual result

System information (as much as possible)

Additional comments