DJ events (v1.4.1) - Joomla 4 - error

DJ events (v1.4.1) - Joomla 4 - error

Goodmorning,

Just installed the new DJ-events version (light) on my Joomla 4 site.
Backend works flawless, but when I try to show some events on the frontend I run into trouble...
I created two test events (one in December 2021 and one for January 2022) and tried to visualize them using both the calendar module as well as the "list events" module.

As soon as I publish any of those modules, my website crashes and showing a "page not found" message.
Also the following error is given:
0 count(): Argument #1 ($value) must be of type Countable|array, bool given

Any help is highly appreciated.
Thanks!


Here is the error report from the website:

Call stack
# Function Location
1 () JROOT/modules/mod_djevents_items/helper.php:132
2 modDJEventsItemsHelper::getItems() JROOT/modules/mod_djevents_items/mod_djevents_items.php:40
3 include() JROOT/libraries/src/Dispatcher/ModuleDispatcher.php:54
4 Joomla\CMS\Dispatcher\ModuleDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/ModuleDispatcher.php:57
5 Joomla\CMS\Dispatcher\ModuleDispatcher->dispatch() JROOT/libraries/src/Helper/ModuleHelper.php:295
6 Joomla\CMS\Helper\ModuleHelper::renderRawModule() JROOT/libraries/src/Helper/ModuleHelper.php:167
7 Joomla\CMS\Helper\ModuleHelper::renderModule() JROOT/libraries/src/Document/Renderer/Html/ModuleRenderer.php:102
8 Joomla\CMS\Document\Renderer\Html\ModuleRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:696
9 Joomla\CMS\Document\HtmlDocument->countModules() JROOT/templates/nature/index.php:111
10 require() JROOT/libraries/src/Document/HtmlDocument.php:769
11 Joomla\CMS\Document\HtmlDocument->_loadTemplate() JROOT/libraries/src/Document/HtmlDocument.php:828
12 Joomla\CMS\Document\HtmlDocument->_fetchTemplate() JROOT/libraries/src/Document/HtmlDocument.php:631
13 Joomla\CMS\Document\HtmlDocument->parse() JROOT/libraries/src/Application/CMSApplication.php:1022
14 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:804
15 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:284
16 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:63
17 require_once() JROOT/index.php:32