Deprecated Functionality: strtotime()

[gerben86]

Plugin version

4.8.0

Magento version

2.4.5p1

PHP version

8.1

What went wrong?

See the error log. Can this also be the reason that brievenbuspakjes aren't working at all on my system?

Reproduction steps

1. Navigate to ...
2. Click on ...
3. See ...

Relevant log output

main.CRITICAL: Exception: Deprecated Functionality: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in vendor/myparcelnl/magento/Block/Sales/View.php on line 81 in vendor/magento/framework/App/ErrorHandler.php:62
Stack trace:
#0 [internal function]: Magento\Framework\App\ErrorHandler->handler()
#1 vendor/myparcelnl/magento/Block/Sales/View.php(81): strtotime()
#2 var/view_preprocessed/pub/static/vendor/myparcelnl/magento/view/adminhtml/templates/order_view.phtml(1): MyParcelNL\Magento\Block\Sales\View->getCheckoutOptionsHtml()
#3 vendor/magento/framework/View/TemplateEngine/Php.php(71): include('...')
#4 vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\TemplateEngine\Php->render()
#5 vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\View\TemplateEngine\Php\Interceptor->___callParent()
#6 vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\View\TemplateEngine\Php\Interceptor->Magento\Framework\Interception\{closure}()
#7 generated/code/Magento/Framework/View/TemplateEngine/Php/Interceptor.php(23): Magento\Framework\View\TemplateEngine\Php\Interceptor->___callPlugins()
#8 vendor/magento/framework/View/Element/Template.php(263): Magento\Framework\View\TemplateEngine\Php\Interceptor->render()
#9 vendor/magento/framework/View/Element/Template.php(293): Magento\Framework\View\Element\Template->fetchView()
#10 vendor/magento/module-backend/Block/Template.php(141): Magento\Framework\View\Element\Template->_toHtml()
#11 vendor/magento/framework/View/Element/AbstractBlock.php(1095): Magento\Backend\Block\Template->_toHtml()
#12 vendor/magento/framework/View/Element/AbstractBlock.php(1099): Magento\Framework\View\Element\AbstractBlock->Magento\Framework\View\Element\{closure}()
#13 vendor/magento/framework/View/Element/AbstractBlock.php(660): Magento\Framework\View\Element\AbstractBlock->_loadCache()
#14 vendor/magento/framework/View/Layout.php(578): Magento\Framework\View\Element\AbstractBlock->toHtml()
#15 vendor/magento/framework/View/Layout.php(555): Magento\Framework\View\Layout->_renderBlock()

Additional context

No response