message: Allow selected permission variable to be null. Closes
diff: @@ -12,7 +12,7 @@ module.exports = {
  let custom_claims = {};
  USER_FIELDS.forEach(user_field => {
  - custom_claims['x-hasura-' + user_field.replace('_', '-')] = user[user_field].toString();
  + custom_claims['x-hasura-' + user_field.replace('_', '-')] = user[user_field] && user[user_field].toString();
  });
  const user_roles = user.user_roles.map(role => {
  