Fatal error: Uncaught Error: Call to a member function getChildrenCategories() on null in /home/shedsdev/public_html/app/code/Sixty/SubcategoryNavigation/Block/Submenu.php:60
Stack trace:
#0 [internal function]: Sixty\SubcategoryNavigation\Block\Submenu->getCategories(NULL)
#1 /home/shedsdev/public_html/vendor/magento/framework/View/TemplateEngine/Php.php(82): call_user_func_array(Array, Array)
#2 /home/shedsdev/public_html/app/code/Sixty/SubcategoryNavigation/view/frontend/templates/sidebar.phtml(4): Magento\Framework\View\TemplateEngine\Php->__call('getCategories', Array)
#3 /home/shedsdev/public_html/vendor/magento/framework/View/TemplateEngine/Php.php(59): include('/home/shedsdev/...')
#4 /home/shedsdev/public_html/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\TemplateEngine\Php->render(Object(Sixty\SubcategoryNavigation\Block\Submenu\Interceptor), '/home/shedsdev/...', Array)
#5 /home/shedsdev/public_html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework in /home/shedsdev/public_html/app/code/Sixty/SubcategoryNavigation/Block/Submenu.php on line 60