This is working perfectly, but for some reason I'm getting thousands of these errors in the ACP:
#0 /home/public_html/library/WidgetFramework/WidgetRenderer.php(483) : runtime-created function(1): XenForo_Application::handlePhpError(8, 'Undefined varia...', '/home/publ...', 1, Array)
#1 [internal function]: __lambda_func(Array)
#2 /home/public_html/library/WidgetFramework/WidgetRenderer.php(487): call_user_func('?lambda_1', Array)
#3 /home/public_html/library/WidgetFramework/WidgetRenderer.php(573): WidgetFramework_WidgetRenderer->_executeExpression('!in_array($cont...', Array)
#4 /home/public_html/library/WidgetFramework/WidgetRenderer/Empty.php(35): WidgetFramework_WidgetRenderer->render(Array, 'forum_list', Array, Object(XenForo_Template_Public), '???????????????...')
#5 /home/public_html/library/WidgetFramework/Core.php(352): WidgetFramework_WidgetRenderer_Empty->render(Array, 'forum_list', Array, Object(XenForo_Template_Public), '???????????????...')
#6 /home/public_html/library/WidgetFramework/Core.php(264): WidgetFramework_Core->_renderWidgetsFor('forum_list', Array, Object(XenForo_Template_Public), '???????????????...')
#7 /home/public_html/library/WidgetFramework/Listener.php(87): WidgetFramework_Core->renderWidgetsFor('forum_list', Array, Object(XenForo_Template_Public), Array)
#8 [internal function]: WidgetFramework_Listener::template_post_render('forum_list', '??????????????<...', Array, Object(XenForo_Template_Public))
#9 /home/public_html/library/XenForo/CodeEvent.php(58): call_user_func_array(Array, Array)
#10 /home/public_html/library/XenForo/Template/Abstract.php(195): XenForo_CodeEvent::fire('template_post_r...', Array, 'forum_list')
#11 /home/public_html/library/XenForo/Template/Public.php(110): XenForo_Template_Abstract->render()
#12 /home/public_html/library/XenForo/ViewRenderer/HtmlPublic.php(119): XenForo_Template_Public->render()
#13 /home/public_html/library/XenForo/FrontController.php(614): XenForo_ViewRenderer_HtmlPublic->renderContainer(Object(XenForo_Template_Public), Array)
#14 /home/public_html/library/XenForo/FrontController.php(158): XenForo_FrontController->renderView(Object(XenForo_ControllerResponse_View), Object(XenForo_ViewRenderer_HtmlPublic), Array)
#15 /home/public_html/index.php(13): XenForo_FrontController->run()
#16 {main}