As stated in https://github.com/node-saml/passport-saml/blob/master/CHANGELOG.md#v200-2020-11-03 and the corresponding PR https://github.com/node-saml/passport-saml/pull/412 passport-saml now always throws error objects instead of strings. This fixes our error logging to accommodate this change. Signed-off-by: David Mehren <git@herrmehren.de>