--- /dev/null
+diff --git a/auth.js b/auth.js
+index ce77ee4..235d8e6 100644
+--- a/auth.js
++++ b/auth.js
+@@ -91,6 +91,7 @@ var cuid = require('cuid');
+ var common = require('./model/common.js');
+ var user = require('./model/user.js');
+ var conf = require('./configuration.js');
++var utils = require('./utils.js');
+
+ var NOT_INTERNAL_AUTH_PWD = 'soooooo_useless';
+
+@@ -232,21 +233,21 @@ module.exports = (function () {
+ // We have to create the user in mypads database
+ ldapConf = conf.get('authLdapSettings');
+ user.set({
+- login: ldapuser[props.login],
++ login: utils.getSingleton(ldapuser[props.login]),
+ password: NOT_INTERNAL_AUTH_PWD,
+- firstname: ldapuser[props.firstname],
+- lastname: ldapuser[props.lastname],
++ firstname: utils.getSingleton(ldapuser[props.firstname]),
++ lastname: utils.getSingleton(ldapuser[props.lastname]),
+ email: mail,
+ lang: ldapConf.defaultLang || 'en'
+ }, callback);
+ } else if (u.email !== mail ||
+- u.firstname !== ldapuser[props.firstname] ||
+- u.lastname !== ldapuser[props.lastname]) {
++ u.firstname !== utils.getSingleton(ldapuser[props.firstname]) ||
++ u.lastname !== utils.getSingleton(ldapuser[props.lastname])) {
+ // Update database and cache informations if needed
+ // (i.e. update from LDAP)
+ u.email = mail;
+- u.firstname = ldapuser[props.firstname];
+- u.lastname = ldapuser[props.lastname];
++ u.firstname = utils.getSingleton(ldapuser[props.firstname]);
++ u.lastname = utils.getSingleton(ldapuser[props.lastname]);
+ u.password = NOT_INTERNAL_AUTH_PWD;
+ user.set(u, callback);
+ } else {
+diff --git a/utils.js b/utils.js
+index 32c2727..d381d06 100644
+--- a/utils.js
++++ b/utils.js
+@@ -14,3 +14,13 @@ exports.callbackify2 = function (fun) {
+ return wrapPromise(fun(arg1, arg2), cb);
+ };
+ };
++
++exports.getSingleton = function (stringOrArray) {
++ if (Array.isArray(stringOrArray)) {
++ if (stringOrArray.length > 0) {
++ return stringOrArray[0];
++ }
++ } else if (stringOrArray) {
++ return stringOrArray;
++ }
++}