[#7532] $this when not in object context on article creation

Debug log.

0 Using $this when not in object context
Call stack
# Function Location
1 () JROOT/plugins/system/cbautoactionsbot/cbautoactionsbot.php(83) : runtime-created function:1
2 __lambda_func() JROOT/libraries/joomla/event/dispatcher.php:165
3 JEventDispatcher->trigger() JROOT/libraries/src/MVC/Model/AdminModel.php:1261
4 Joomla\CMS\MVC\Model\AdminModel->save() JROOT/administrator/components/com_content/models/article.php:676
5 ContentModelArticle->save() JROOT/components/com_content/models/form.php:191
6 ContentModelForm->save() JROOT/libraries/src/MVC/Controller/FormController.php:754
7 Joomla\CMS\MVC\Controller\FormController->save() JROOT/components/com_content/controllers/article.php:355
8 ContentControllerArticle->save() JROOT/libraries/src/MVC/Controller/BaseController.php:710
9 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43
10 require_once() JROOT/libraries/src/Component/ComponentHelper.php:402
11 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377
12 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194
13 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233
14 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:196
15 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49

All of the plugins have been updated to current and this is new recent behavior.
Help on this would be appreciated.

PHP Version in Cpanel was set to 7.1. Updated to 7.3 and problem was fixed.

That's actually a bug. $this needs to be passed as part of the use usage of the anon function. Have added a bug ticket and fixed for next build.

forge.joomlapolis.com/issues/7532

It only impacts some versions of PHP though as you've noticed after updating to 7.3.