Application error.

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Call to a member function publishedVersion() on null
Error: Call to a member function publishedVersion() on null in /var/www/html/src/lib/Schoolwiki/Content/PageContent.php:123 Stack trace: #0 /var/www/html/src/lib/Schoolwiki/Util/RouteHelpers.php(75): Schoolwiki\Content\PageContent::getPage(Object(Schoolwiki\Models\Site), 'pta-45-havo-202...') #1 /var/www/html/src/web/index.php(309): Schoolwiki\Util\RouteHelpers::renderPage('keizer-karel-co...', 'pta-45-havo-202...', Array, Array, Object(Schoolwiki\Models\Site)) #2 [internal function]: Sandbox\Container->{closure}('pta-45-havo-202...') #3 /var/www/html/vendor/includable/runtime/src/lib/HTTP/Router.php(388): call_user_func_array(Object(Closure), Array) #4 /var/www/html/vendor/includable/runtime/src/lib/HTTP/Router.php(150): Includable\HTTP\Router->callback(Object(Closure), Array) #5 [internal function]: Includable\HTTP\Router->run('get', '/:school', Object(Closure)) #6 /var/www/html/vendor/includable/runtime/src/lib/HTTP/Router.php(336): call_user_func_array(Array, Array) #7 /var/www/html/src/web/index.php(333): Includable\HTTP\Router->__call('get', Array) #8 /var/www/html/vendor/includable/runtime/src/modules/Sandbox/Container.php(213): include('/var/www/html/s...') #9 /var/www/html/vendor/includable/runtime/src/modules/Sandbox/Sandbox.php(181): Sandbox\Container->main('/var/www/html/s...', Array, false) #10 /var/www/html/vendor/includable/runtime/src/modules/Models/Module.php(790): Sandbox\Sandbox->run('/var/www/html/s...') #11 /var/www/html/vendor/includable/runtime/src/controllers/Site.php(631): Module->run(Object(Community), Array) #12 /var/www/html/vendor/includable/runtime/src/modules/Core/Controller/Controller.php(308): Site->module() #13 /var/www/html/vendor/includable/runtime/src/lib/Framework.php(89): Core\Controller\Controller->route('/pta-45-havo-20...') #14 /var/www/html/index.php(14): Includable\Framework::init(Array) #15 {main}