TypeError: Argument 1 passed to Drupal\Core\Form\FormState::setError() must be of the type array, null given, called in /var/www/drupalvm/web/core/lib/Drupal/Core/Field/WidgetBase.php on line 439

Problem/Motivation

When I try to delete a paragraph from a node I get an ajax error and in logs I find the following error:
TypeError: Argument 1 passed to Drupal\Core\Form\FormState::setError() must be of the type array, null given, called in /var/www/drupalvm/web/core/lib/Drupal/Core/Field/WidgetBase.php on line 439
The paragraph itself contains one text field and two paragraph references. Also I am unable to add more paragraphs if this paragraph is already added.