trim(): Passing null to parameter #1 ($string) of type string is deprecated

[swissup]

trim(): Passing null to parameter #1 ($string) of type string is deprecated

[vovayatsyuk]

The weird part is that toHtml method should return a string. Do you know why it returns null in your case?

[Detzler]

@vovayatsyuk @0m3r men you're fast.

Do you know why it returns null in your case?

No, I don't recognize the cause. Here is the full strack trace. Maybe a 3rd party thing. Errors appear on category and product pages.

1 exception(s):
Exception #0 (Exception): Deprecated Functionality: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/vendor/swissup/module-core/Plugin/SetEmptyStringIfOutputEmpty.php on line 18

Exception #0 (Exception): Deprecated Functionality: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/vendor/swissup/module-core/Plugin/SetEmptyStringIfOutputEmpty.php on line 18
<pre>#1 trim() called at [vendor/swissup/module-core/Plugin/SetEmptyStringIfOutputEmpty.php:18]
#2 Swissup\Core\Plugin\SetEmptyStringIfOutputEmpty->afterToHtml() called at [vendor/magento/framework/Interception/Interceptor.php:146]
#3 Magento\Wishlist\Block\Catalog\Product\ProductList\Item\AddTo\Wishlist\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/framework/Interception/Interceptor.php:153]
#4 Magento\Wishlist\Block\Catalog\Product\ProductList\Item\AddTo\Wishlist\Interceptor->___callPlugins() called at [generated/code/Magento/Wishlist/Block/Catalog/Product/ProductList/Item/AddTo/Wishlist/Interceptor.php:527]
#5 Magento\Wishlist\Block\Catalog\Product\ProductList\Item\AddTo\Wishlist\Interceptor->toHtml() called at [vendor/magento/framework/View/Layout.php:578]
#6 Magento\Framework\View\Layout->_renderBlock() called at [vendor/magento/framework/View/Layout.php:555]
#7 Magento\Framework\View\Layout->renderNonCachedElement() called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:149]
#8 Magento\Framework\View\Layout\Interceptor->renderNonCachedElement() called at [vendor/magento/framework/View/Layout.php:510]
#9 Magento\Framework\View\Layout->renderElement() called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:140]
#10 Magento\Framework\View\Layout\Interceptor->renderElement() called at [vendor/magento/framework/View/Element/AbstractBlock.php:511]
#11 Magento\Framework\View\Element\AbstractBlock->getChildHtml() called at [vendor/magento/module-catalog/Block/Product/ProductList/Item/Container.php:33]
#12 Magento\Catalog\Block\Product\ProductList\Item\Container->getChildHtml() called at [generated/code/Magento/Catalog/Block/Product/ProductList/Item/Container/Interceptor.php:23]
#13 Magento\Catalog\Block\Product\ProductList\Item\Container\Interceptor->getChildHtml() called at [vendor/magento/module-catalog/view/frontend/templates/product/list.phtml:129]
#14 include() called at [vendor/magento/framework/View/TemplateEngine/Php.php:71]
#15 Magento\Framework\View\TemplateEngine\Php->render() called at [vendor/magento/framework/View/Element/Template.php:263]
#16 Magento\Framework\View\Element\Template->fetchView() called at [generated/code/Magento/Catalog/Block/Product/ListProduct/Interceptor.php:392]
#17 Magento\Catalog\Block\Product\ListProduct\Interceptor->fetchView() called at [vendor/magento/framework/View/Element/Template.php:293]
#18 Magento\Framework\View\Element\Template->_toHtml() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1095]
#19 Magento\Framework\View\Element\AbstractBlock->Magento\Framework\View\Element\{closure}() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1099]
#20 Magento\Framework\View\Element\AbstractBlock->_loadCache() called at [vendor/magento/framework/View/Element/AbstractBlock.php:660]
#21 Magento\Framework\View\Element\AbstractBlock->toHtml() called at [vendor/magento/framework/Interception/Interceptor.php:58]
#22 Magento\Catalog\Block\Product\ListProduct\Interceptor->___callParent() called at [vendor/magento/framework/Interception/Interceptor.php:138]
#23 Magento\Catalog\Block\Product\ListProduct\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/framework/Interception/Interceptor.php:153]
#24 Magento\Catalog\Block\Product\ListProduct\Interceptor->___callPlugins() called at [generated/code/Magento/Catalog/Block/Product/ListProduct/Interceptor.php:617]
#25 Magento\Catalog\Block\Product\ListProduct\Interceptor->toHtml() called at [vendor/weltpixel/module-google-tag-manager-free/Block/Category.php:21]
#26 WeltPixel\GoogleTagManager\Block\Category->getProductCollection()
#27 call_user_func_array() called at [vendor/magento/framework/View/TemplateEngine/Php.php:94]
#28 Magento\Framework\View\TemplateEngine\Php->__call() called at [vendor/weltpixel/module-google-tag-manager-free/view/frontend/templates/category.phtml:8]
#29 include() called at [vendor/magento/framework/View/TemplateEngine/Php.php:71]
#30 Magento\Framework\View\TemplateEngine\Php->render() called at [vendor/magento/framework/View/Element/Template.php:263]
#31 Magento\Framework\View\Element\Template->fetchView() called at [vendor/magento/framework/View/Element/Template.php:293]
#32 Magento\Framework\View\Element\Template->_toHtml() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1095]
#33 Magento\Framework\View\Element\AbstractBlock->Magento\Framework\View\Element\{closure}() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1099]
#34 Magento\Framework\View\Element\AbstractBlock->_loadCache() called at [vendor/magento/framework/View/Element/AbstractBlock.php:660]
#35 Magento\Framework\View\Element\AbstractBlock->toHtml() called at [vendor/weltpixel/module-google-tag-manager-free/Helper/Data.php:415]
#36 WeltPixel\GoogleTagManager\Helper\Data->addCategoryPageInformation() called at [vendor/weltpixel/module-google-tag-manager-free/Helper/Data.php:347]
#37 WeltPixel\GoogleTagManager\Helper\Data->getDataLayerScript() called at [vendor/weltpixel/module-google-tag-manager-free/Observer/CoreLayoutRenderElementObserver.php:40]
#38 WeltPixel\GoogleTagManager\Observer\CoreLayoutRenderElementObserver->execute() called at [vendor/magento/framework/Event/Invoker/InvokerDefault.php:88]
#39 Magento\Framework\Event\Invoker\InvokerDefault->_callObserverMethod() called at [vendor/magento/framework/Event/Invoker/InvokerDefault.php:74]
#40 Magento\Framework\Event\Invoker\InvokerDefault->dispatch() called at [vendor/magento/framework/Event/Manager.php:65]
#41 Magento\Framework\Event\Manager->dispatch() called at [generated/code/Magento/Framework/Event/Manager/Proxy.php:95]
#42 Magento\Framework\Event\Manager\Proxy->dispatch() called at [vendor/magento/framework/View/Layout.php:518]
#43 Magento\Framework\View\Layout->renderElement() called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:140]
#44 Magento\Framework\View\Layout\Interceptor->renderElement() called at [vendor/magento/framework/View/Element/AbstractBlock.php:511]
#45 Magento\Framework\View\Element\AbstractBlock->getChildHtml() called at [vendor/magento/module-theme/view/frontend/templates/html/container.phtml:7]
#46 include() called at [vendor/magento/framework/View/TemplateEngine/Php.php:71]
#47 Magento\Framework\View\TemplateEngine\Php->render() called at [vendor/magento/framework/View/Element/Template.php:263]
#48 Magento\Framework\View\Element\Template->fetchView() called at [vendor/magento/framework/View/Element/Template.php:293]
#49 Magento\Framework\View\Element\Template->_toHtml() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1095]
#50 Magento\Framework\View\Element\AbstractBlock->Magento\Framework\View\Element\{closure}() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1099]
#51 Magento\Framework\View\Element\AbstractBlock->_loadCache() called at [vendor/magento/framework/View/Element/AbstractBlock.php:660]
#52 Magento\Framework\View\Element\AbstractBlock->toHtml() called at [vendor/magento/framework/View/Result/Page.php:253]
#53 Magento\Framework\View\Result\Page->render() called at [vendor/magento/framework/View/Result/Layout.php:171]
#54 Magento\Framework\View\Result\Layout->renderResult() called at [vendor/magento/framework/Interception/Interceptor.php:58]
#55 Magento\Framework\View\Result\Page\Interceptor->___callParent() called at [vendor/magento/framework/Interception/Interceptor.php:138]
#56 Magento\Framework\View\Result\Page\Interceptor->Magento\Framework\Interception\{closure}() called at [app/code/Magezon/Core/Plugin/View/Result/Layout.php:24]
#57 Magezon\Core\Plugin\View\Result\Layout->aroundRenderResult() called at [vendor/magento/framework/Interception/Interceptor.php:135]
#58 Magento\Framework\View\Result\Page\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/framework/Interception/Interceptor.php:153]
#59 Magento\Framework\View\Result\Page\Interceptor->___callPlugins() called at [generated/code/Magento/Framework/View/Result/Page/Interceptor.php:95]
#60 Magento\Framework\View\Result\Page\Interceptor->renderResult() called at [vendor/magento/framework/App/Http.php:120]
#61 Magento\Framework\App\Http->launch() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:23]
#62 Magento\Framework\App\Http\Interceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:264]
#63 Magento\Framework\App\Bootstrap->run() called at [pub/index.php:30]
</pre>