Non-existent changeset UUID

Hi, since updating to wordpress 4.7 I am having issues with mapped domains displaying the error “Non-existent changeset UUID” when I go to the customiser. I have disabled all pluggins apart from domain mapping. Changing themes does not help and everything works fine on unmapped domains. There was another forum post on this subject but no answer on how to solve it. I have grated support access for you to take a look. Thanks Chris