Fatal Drupal 8 update

I have updated my Drupal 8 website to the current version.
After updating, the front page shows this message:

InvalidArgumentException: Field is unknown. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 509 of core\lib\Drupal\Core\Entity\ContentEntityBase.php).

Drupal\Core\Entity\ContentEntityBase->get() (Line: 48)
Drupal\node\Entity\Node->isPublished()
call_user_func_array(Array, Array) (Line: 596)
Twig_Template->getAttribute(Object, 'isPublished', Array, 'method') (Line: 47)
__TwigTemplate_3a7f261c43981f8d50f37aa204df584417cff476c1e8f1407ac502e8a54ca2ae->doDisplay(Array, Array) (Line: 379)
Twig_Template->displayWithErrorHandling(Array, Array) (Line: 347)
Twig_Template->display(Array) (Line: 358)
Twig_Template->render(Array) (Line: 64)
twig_render_template('themes/bootstrap/templates/node/node.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 435)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 574)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 149)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

I have run update.php (several times, in fact) but nothing changes. When I run cron.php, I get a 'page not found' with admin-bar at the top, so apparently I can still do a few things, but my nodes are not showing, just the above message.
Does anyone know what the hell is going on here?
I am running a rather simple Drupal site with only the added modules ctools, easy_breadcrumb, linkit, metatag, name, pathauto, photoswipe, token and views_php installed. Running on a windows machine.

Any help highly appreciated, as I can't go on!