Drupal Fatal Error - LogicException: The controller result claims to be providing relevant cache metadata, but leaked metadata was detected.

Error:

LogicException: The controller result claims to be providing relevant cache metadata, but leaked metadata was detected. Please ensure you are not rendering content too early. Returned object class: Drupal\Core\Render\HtmlResponse. in Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line 154 in web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php).

Drupal Module "rules" hat es verursacht. Temporäre Lösung war das Modul zu entfernen. Aber was ist die richtige Lösung?