LDAP error

ERR/auth-ldap 7455 [::ffff:127.0.0.1] Unexpected error AssertionError: options.attribute (string) is required
    at EqualityFilter (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/ldap-filter/lib/equality_filter.js:15:12)
    at new EqualityFilter (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/ldapjs/lib/filters/equality_filter.js:16:26)
    at tryFind (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/lib/util/ldaputil.js:55:15)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/lib/util/ldaputil.js:108:12
From previous event:
    at Object.module.exports.login (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/lib/util/ldaputil.js:107:23)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/lib/units/auth/ldap.js:71:29
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)
From previous event:
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/lib/units/auth/ldap.js:70:12
    at Layer.handle [as handle_request] (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/layer.js:95:5)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:335:12)
    at next (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:275:10)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/lib/units/auth/ldap.js:50:5
    at Layer.handle [as handle_request] (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:317:13)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:335:12)
    at next (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:275:10)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express-validator/lib/express_validator.js:291:5
    at Layer.handle [as handle_request] (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:317:13)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:335:12)
    at next (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:275:10)
    at csrf (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/csurf/index.js:117:5)
    at Layer.handle [as handle_request] (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:317:13)
    at /home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/autotest/.nvm/versions/node/v6.11.2/lib/node_modules/stf/node_modules/express/lib/router/index.js:335:12)