I get this error when searching for any email address in advanced search or search builder.
The 1-address alias is not defined, so it fails. In advanced search it does not let me select the location type for the email. However, in search builder it does and it still fails. I tested this on the demo https://wpmaster.demo.civicrm.org/ and email search works there. I have disabled all civi extensions and it still fails.
WP 5.2.1 and Civi 5.13.4 multisite. Anyone else seeing this?