Error: Call to a member function getStoreIds() on null in /var/www/html/vendor/mageplaza/magento-2-blog-extension/Block/Adminhtml/Category/Tree.php:178 Stack trace: #0 /var/www/html/vendor/magento/module-catalog/Block/Adminhtml/Category/Tree.php(311): Mageplaza\Blog\Block\Adminhtml\Category\Tree->_getNodeJson() #1 /var/www/html/vendor/mageplaza/magento-2-blog-extension/Block/Adminhtml/Category/Tree.php(140): Magento\Catalog\Block\Adminhtml\Category\Tree->getTree() #2 /var/www/html/vendor/mageplaza/magento-2-blog-extension/Block/Category/Widget.php(44): Mageplaza\Blog\Block\Adminhtml\Category\Tree->getTree() #3 /var/www/html/vendor/mageplaza/magento-2-blog-extension/view/frontend/templates/category/widget.phtml(22): Mageplaza\Blog\Block\Category\Widget->getTree() #4 /var/www/html/vendor/magento/framework/View/TemplateEngine/Php.php(71): include('/var/www/html/v...') #5 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\TemplateEngine\Php->render() #6 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\View\TemplateEngine\Php\Interceptor->___callParent() #7 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\View\TemplateEngine\Php\Interceptor->Magento\Framework\Interception\{closure}() #8 /var/www/html/generated/code/Magento/Framework/View/TemplateEngine/Php/Interceptor.php(23): Magento\Framework\View\TemplateEngine\Php\Interceptor->___callPlugins() #9 /var/www/html/vendor/magento/framework/View/Element/Template.php(273): Magento\Framework\View\TemplateEngine\Php\Interceptor->render() #10 /var/www/html/vendor/magento/framework/View/Element/Template.php(303): Magento\Framework\View\Element\Template->fetchView() #11 /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php(1111): Magento\Framework\View\Element\Template->_toHtml() #12 /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php(1115): Magento\Framework\View\Element\AbstractBlock->Magento\Framework\View\Element\{closure}() #13 /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php(675): Magento\Framework\View\Element\AbstractBlock->_loadCache() #14 /var/www/html/vendor/magento/framework/View/Layout.php(566): Magento\Framework\View\Element\AbstractBlock->toHtml() #15 /var/www/html/vendor/magento/framework/View/Layout.php(542): Magento\Framework\View\Layout->_renderBlock() #16 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #17 /var/www/html/vendor/magento/framework/View/Layout.php(594): Magento\Framework\View\Layout->renderElement() #18 /var/www/html/vendor/magento/framework/View/Layout.php(544): Magento\Framework\View\Layout->_renderContainer() #19 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #20 /var/www/html/vendor/magento/framework/View/Layout.php(594): Magento\Framework\View\Layout->renderElement() #21 /var/www/html/vendor/magento/framework/View/Layout.php(544): Magento\Framework\View\Layout->_renderContainer() #22 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #23 /var/www/html/vendor/magento/framework/View/Layout.php(594): Magento\Framework\View\Layout->renderElement() #24 /var/www/html/vendor/magento/framework/View/Layout.php(544): Magento\Framework\View\Layout->_renderContainer() #25 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #26 /var/www/html/vendor/magento/framework/View/Layout.php(594): Magento\Framework\View\Layout->renderElement() #27 /var/www/html/vendor/magento/framework/View/Layout.php(544): Magento\Framework\View\Layout->_renderContainer() #28 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #29 /var/www/html/vendor/magento/framework/View/Layout.php(594): Magento\Framework\View\Layout->renderElement() #30 /var/www/html/vendor/magento/framework/View/Layout.php(544): Magento\Framework\View\Layout->_renderContainer() #31 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #32 /var/www/html/vendor/magento/framework/View/Layout.php(594): Magento\Framework\View\Layout->renderElement() #33 /var/www/html/vendor/magento/framework/View/Layout.php(544): Magento\Framework\View\Layout->_renderContainer() #34 /var/www/html/vendor/magento/framework/View/Layout.php(497): Magento\Framework\View\Layout->renderNonCachedElement() #35 /var/www/html/vendor/magento/framework/View/Layout.php(963): Magento\Framework\View\Layout->renderElement() #36 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\Layout->getOutput() #37 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\View\Layout\Interceptor->___callParent() #38 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\View\Layout\Interceptor->Magento\Framework\Interception\{closure}() #39 /var/www/html/generated/code/Magento/Framework/View/Layout/Interceptor.php(50): Magento\Framework\View\Layout\Interceptor->___callPlugins() #40 /var/www/html/vendor/magento/framework/View/Result/Page.php(258): Magento\Framework\View\Layout\Interceptor->getOutput() #41 /var/www/html/vendor/magento/framework/View/Result/Layout.php(171): Magento\Framework\View\Result\Page->render() #42 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\Result\Layout->renderResult() #43 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\View\Result\Page\Interceptor->___callParent() #44 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\View\Result\Page\Interceptor->Magento\Framework\Interception\{closure}() #45 /var/www/html/generated/code/Magento/Framework/View/Result/Page/Interceptor.php(23): Magento\Framework\View\Result\Page\Interceptor->___callPlugins() #46 /var/www/html/vendor/magento/framework/App/Http.php(120): Magento\Framework\View\Result\Page\Interceptor->renderResult() #47 /var/www/html/vendor/magento/framework/App/Bootstrap.php(263): Magento\Framework\App\Http->launch() #48 /var/www/html/index.php(39): Magento\Framework\App\Bootstrap->run() #49 {main}