diff --git a/auth.js b/auth.js
index ce77ee4..de66b03 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';
 
@@ -212,6 +213,7 @@ module.exports = (function () {
             }
             return callback(new Error(emsg), false);
           }
+          console.log("before user.get");
           user.get(login, function(err, u) {
             var props = ldapConf.properties;
             var mail;
@@ -229,27 +231,30 @@ module.exports = (function () {
               return callback(new Error(emsg), false);
             }
             if (err) {
+              console.log("in user.get err");
               // 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)
+                console.log("in user.get update");
                 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 {
+                console.log("in user.get callback");
               return callback(null, u);
             }
           });
diff --git a/model/common.js b/model/common.js
index b19829b..9421742 100644
--- a/model/common.js
+++ b/model/common.js
@@ -94,6 +94,7 @@ module.exports = (function() {
       var isFS = function (s) { return (ld.isString(s) && !ld.isEmpty(s)); };
       ld.forEach(strFields, function (s) {
         if (!isFS(params[s])) {
+          console.log(params, s);
           throw new TypeError('BACKEND.ERROR.TYPE.PARAM_STR');
         }
         if (s.length > 100) {
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;
+  }
+}