warning during update

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From user: nojj

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during update from beta 8 to beta 9 I got following warning:

Notice: Undefined index: configuration in Drupal\eca\Service\Conditions->assertCondition() (line 182 of modules/contrib/eca/src/Service/Conditions.php).
Drupal\eca\Service\Conditions->assertCondition(Object, 'Flow_0vgujvv', Array, Array) (Line: 646)
Drupal\eca\Entity\Eca->getSuccessors(Object, Object, Array) (Line: 170)
Drupal\eca\Processor->executeSuccessors(Object, Object, Object, Array) (Line: 140)
Drupal\eca\Processor->execute(Object, 'kernel.request') (Line: 77)
Drupal\eca\EventSubscriber\EcaBase->onEvent(Object, 'kernel.request', Object)
call_user_func(Array, Object, 'kernel.request', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.request') (Line: 134)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 80)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 42)
Drupal\webform_product\RedirectMiddleware->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

I modified the settings.php as suggested. for Drush updb I got "No pending updates"