yii\base\InvalidArgumentException: Invalid numeric value:  in /var/www/html/vendor/craftcms/cms/src/helpers/Db.php:621
Stack trace:
#0 /var/www/html/vendor/craftcms/cms/src/helpers/Db.php(891): craft\helpers\Db::parseParam()
#1 /var/www/html/vendor/craftcms/cms/src/elements/db/ElementQuery.php(1662): craft\helpers\Db::parseNumericParam()
#2 /var/www/html/vendor/yiisoft/yii2/db/QueryBuilder.php(227): craft\elements\db\ElementQuery->prepare()
#3 /var/www/html/vendor/yiisoft/yii2/db/Query.php(157): yii\db\QueryBuilder->build()
#4 /var/www/html/vendor/yiisoft/yii2/db/Query.php(249): yii\db\Query->createCommand()
#5 /var/www/html/vendor/craftcms/cms/src/db/Query.php(292): yii\db\Query->all()
#6 /var/www/html/vendor/craftcms/cms/src/elements/db/ElementQuery.php(1848): craft\db\Query->all()
#7 /var/www/html/vendor/craftcms/cms/src/services/Elements.php(3304): craft\elements\db\ElementQuery->all()
#8 /var/www/html/vendor/craftcms/cms/src/services/Elements.php(3180): craft\services\Elements->_eagerLoadElementsInternal()
#9 /var/www/html/vendor/craftcms/cms/src/base/NestedElementTrait.php(170): craft\services\Elements->eagerLoadElements()
#10 /var/www/html/vendor/craftcms/cms/src/base/NestedElementTrait.php(236): craft\elements\Entry->getPrimaryOwner()
#11 /var/www/html/vendor/craftcms/cms/src/base/NestedElementTrait.php(302): craft\elements\Entry->getOwner()
#12 /var/www/html/vendor/craftcms/cms/src/elements/Entry.php(1488): craft\elements\Entry->getField()
#13 /var/www/html/vendor/craftcms/cms/src/elements/Entry.php(1529): craft\elements\Entry->getAvailableEntryTypes()
#14 /var/www/html/vendor/craftcms/cms/src/elements/Entry.php(1410): craft\elements\Entry->getType()
#15 /var/www/html/vendor/craftcms/cms/src/base/Element.php(1711): craft\elements\Entry->getFieldLayout()
#16 [internal function]: craft\base\Element::craft\base\{closure}()
#17 /var/www/html/vendor/craftcms/cms/src/base/Element.php(1710): array_filter()
#18 /var/www/html/vendor/craftcms/cms/src/base/NestedElementTrait.php(60): craft\base\Element::eagerLoadingMap()
#19 /var/www/html/vendor/craftcms/cms/src/elements/Entry.php(732): craft\elements\Entry::traitEagerLoadingMap()
#20 /var/www/html/vendor/craftcms/cms/src/services/Elements.php(3218): craft\elements\Entry::eagerLoadingMap()
#21 /var/www/html/vendor/craftcms/cms/src/services/Elements.php(3180): craft\services\Elements->_eagerLoadElementsInternal()
#22 /var/www/html/vendor/craftcms/cms/src/elements/db/ElementQuery.php(1805): craft\services\Elements->eagerLoadElements()
#23 /var/www/html/vendor/craftcms/cms/src/elements/db/EntryQuery.php(948): craft\elements\db\ElementQuery->afterPopulate()
#24 /var/www/html/vendor/craftcms/cms/src/elements/db/ElementQuery.php(1776): craft\elements\db\EntryQuery->afterPopulate()
#25 /var/www/html/vendor/yiisoft/yii2/db/Query.php(251): craft\elements\db\ElementQuery->populate()
#26 /var/www/html/vendor/craftcms/cms/src/db/Query.php(292): yii\db\Query->all()
#27 /var/www/html/vendor/craftcms/cms/src/elements/db/ElementQuery.php(1848): craft\db\Query->all()
#28 /var/www/html/vendor/craftcms/cms/src/elements/db/ElementQuery.php(1857): craft\elements\db\ElementQuery->all()
#29 /var/www/html/vendor/twig/twig/src/Extension/CoreExtension.php(1861): craft\elements\db\ElementQuery->collect()
#30 /var/www/html/vendor/craftcms/cms/src/helpers/Template.php(148): Twig\Extension\CoreExtension::getAttribute()
#31 /var/www/html/storage/runtime/compiled_templates/38/3888320676199db1a4fa214d1d0eccae.php(431): craft\helpers\Template::attribute()
#32 /var/www/html/vendor/twig/twig/src/Template.php(431): __TwigTemplate_65afdaa499a57b46ad8bb9362b5b9eb4->block_content()
#33 /var/www/html/storage/runtime/compiled_templates/fe/fef15792cc0876b692c6b94cd06b14c7.php(331): Twig\Template->yieldBlock()
#34 /var/www/html/vendor/twig/twig/src/Template.php(387): __TwigTemplate_c66e757c3619fcfbdfde127ad4cf3cf3->doDisplay()
#35 /var/www/html/storage/runtime/compiled_templates/38/3888320676199db1a4fa214d1d0eccae.php(52): Twig\Template->yield()
#36 /var/www/html/vendor/twig/twig/src/Template.php(387): __TwigTemplate_65afdaa499a57b46ad8bb9362b5b9eb4->doDisplay()
#37 /var/www/html/vendor/twig/twig/src/Template.php(343): Twig\Template->yield()
#38 /var/www/html/vendor/twig/twig/src/Template.php(358): Twig\Template->display()
#39 /var/www/html/vendor/twig/twig/src/TemplateWrapper.php(35): Twig\Template->render()
#40 /var/www/html/vendor/twig/twig/src/Environment.php(320): Twig\TemplateWrapper->render()
#41 /var/www/html/vendor/craftcms/cms/src/web/View.php(576): Twig\Environment->render()
#42 /var/www/html/vendor/craftcms/cms/src/web/View.php(629): craft\web\View->renderTemplate()
#43 /var/www/html/vendor/craftcms/cms/src/web/TemplateResponseFormatter.php(57): craft\web\View->renderPageTemplate()
#44 /var/www/html/vendor/yiisoft/yii2/web/Response.php(1109): craft\web\TemplateResponseFormatter->format()
#45 /var/www/html/vendor/craftcms/cms/src/web/Response.php(341): yii\web\Response->prepare()
#46 /var/www/html/vendor/yiisoft/yii2/web/Response.php(340): craft\web\Response->prepare()
#47 /var/www/html/vendor/yiisoft/yii2/base/Application.php(390): yii\web\Response->send()
#48 /var/www/html/web/index.php(12): yii\base\Application->run()
#49 {main}

{% set articles = craft.entries.relatedTo({element: category, field: 'articleCategory'}) %}
{% set notFeaturedPosts = articles.isFeatured(false) %}
{% for entry in notFeaturedPosts.collect() %}
    {% include 'partials/entry-teaser' %}
{% endfor %}