The SQL storage cannot change the schema for an existing entity type (node) with data

Hi all,

When updating from 8.4.5 to 8.5.1 I have this error (on 4 different sites):

system-module
#8501 bijwerken
Mislukt: Drupal\Core\Entity\EntityStorageException: The SQL storage cannot change the schema for an existing entity type (node) with data. in Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema->onEntityTypeUpdate() (regel 347 van /home/oms/domains/domain.nl/public_html/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php).

What can I do to fix this?

Thanks,
Rolf