[gelöst]Datenbankupdatet scheitert bei Update auf 8.7.14

Hallo,
beim Update auf 8.7.14 erhalte ich diese Meldung:

The website encountered an unexpected error. Please try again later.

Im Protokoll finde ich dazu diese umfassende Auskunft:

Warning: Illegal string offset 'value' in Drupal\views\Plugin\views\area\Text->preQuery() (Zeile 50 in /core/modules/views/src/Plugin/views/area/Text.php)

#0 /core/includes/bootstrap.inc(587): _drupal_error_handler_real(2, 'Illegal string ...', '/kunden/557110_...', 50, Array)
#1 /core/modules/views/src/Plugin/views/area/Text.php(50): _drupal_error_handler(2, 'Illegal string ...', '/kunden/557110_...', 50, Array)
#2 /core/modules/views/src/ViewExecutable.php(1011): Drupal\views\Plugin\views\area\Text->preQuery()
#3 /core/modules/views/src/ViewExecutable.php(1233): Drupal\views\ViewExecutable->_preQuery()
#4 /core/modules/views/src/Plugin/views/display/PathPluginBase.php(390): Drupal\views\ViewExecutable->build()
#5 /core/modules/views/src/Plugin/views/display/Page.php(180): Drupal\views\Plugin\views\display\PathPluginBase->execute()
#6 /core/modules/views/src/ViewExecutable.php(1630): Drupal\views\Plugin\views\display\Page->execute()
#7 /core/modules/views/src/Element/View.php(77): Drupal\views\ViewExecutable->executeDisplay('page', Array)
#8 [internal function]: Drupal\views\Element\View::preRenderViewElement(Array)
#9 /core/lib/Drupal/Core/Render/Renderer.php(378): call_user_func(Array, Array)
#10 /core/lib/Drupal/Core/Render/Renderer.php(195): Drupal\Core\Render\Renderer->doRender(Array, false)
#11 /core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php(226): Drupal\Core\Render\Renderer->render(Array, false)
#12 /core/lib/Drupal/Core/Render/Renderer.php(582): Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}()
#13 /core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php(227): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#14 /core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php(117): Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\CurrentRouteMatch))
#15 /core/lib/Drupal/Core/EventSubscriber/MainContentViewSubscriber.php(90): Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\CurrentRouteMatch))
#16 [internal function]: Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object(Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent), 'kernel.view', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#17 /core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(111): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent), 'kernel.view', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#18 /vendor/symfony/http-kernel/HttpKernel.php(156): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object(Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent))
#19 /vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#20 /core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 /core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 /core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 /core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 /core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#25 /core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#26 /vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#27 /core/lib/Drupal/Core/DrupalKernel.php(693): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#28 /index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#29 {main}.

Hab dazu bislang nichts passendes gefunden, wie es weiter gehen könnte.
Kann mir jemand helfen?