Those widgets do not display in the footer and the error log is full of stuff like this:
- ErrorException: [E_WARNING] Creating default object from empty value
-
- src/XF/Widget/Html.php:47
-
Stack trace
#0 src/XF/Widget/Html.php(47): XF::handlePhpError(2, '[E_WARNING] Cre...', '/home/...', 47, Array)
#1 src/XF/Admin/Controller/Widget.php(121): XF\Widget\Html->verifyOptions(Object(XF\Http\Request), Array, NULL)
#2 src/XF/Mvc/FormAction.php(168): XF\Admin\Controller\Widget->XF\Admin\Controller\{closure}(Object(XF\Mvc\FormAction))
#3 src/XF/Admin/Controller/Widget.php(157): XF\Mvc\FormAction->run()
#4 src/XF/Mvc/Dispatcher.php(321): XF\Admin\Controller\Widget->actionSave(Object(XF\Mvc\ParameterBag))
#5 src/XF/Mvc/Dispatcher.php(244): XF\Mvc\Dispatcher->dispatchClass('XF:Widget', 'Save', Object(XF\Mvc\RouteMatch), Object(XF\Admin\Controller\Widget), NULL)
#6 src/XF/Mvc/Dispatcher.php(100): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(XF\Admin\Controller\Widget), NULL)
#7 src/XF/Mvc/Dispatcher.php(50): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#8 src/XF/App.php(2177): XF\Mvc\Dispatcher->run()
#9 src/XF.php(390): XF\App->run()
#10 admin.php(13): XF::runApp('XF\\Admin\\App')
#11 {main}