diff --git a/README.md b/README.md
index a17d55b..5342a5f 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,20 @@
 # Oc Sms
+
+## Introduction
+
+Oc Sms provides a webinterface to display your SMS conversations.
+
+SMS conversations are pushed by your Android devices using ownCloud Sms app, available on Google Play Store
+
+Android download link: https://play.google.com/store/apps/details?id=fr.unix_experience.owncloud_sms
+
+## Licence
+
+OcSMS web application is actually under AGPL licence but this free licence can be modificated to a better free licence.
+
+## Requirements
+- An ownCloud instance
+
+
+## Installation
 Place this app in **owncloud/apps/**
-
-
-## Running tests
-After [Installing PHPUnit](http://phpunit.de/getting-started.html) run:
-
-    phpunit tests/
\ No newline at end of file
diff --git a/controller/smscontroller.php b/controller/smscontroller.php
index 20f4ea3..96012c0 100644
--- a/controller/smscontroller.php
+++ b/controller/smscontroller.php
@@ -16,6 +16,7 @@ use \OCP\IRequest;
 use \OCP\AppFramework\Http\TemplateResponse;
 use \OCP\AppFramework\Controller;
 use \OCP\AppFramework\Http\JSONResponse;
+use \OCA\OcSms\AppInfo\OcSmsApp;
 use \OCA\OcSms\Db\SmsMapper;
 
 class SmsController extends Controller {
diff --git a/db/sms.php b/db/sms.php
index 7095b58..000de01 100644
--- a/db/sms.php
+++ b/db/sms.php
@@ -1,5 +1,4 @@
 <?php
-// db/author.php
 namespace OCA\OcSms\Db;
 
 use \OCP\AppFramework\Db\Entity;
diff --git a/db/smsmapper.php b/db/smsmapper.php
index fd1260a..48ec313 100644
--- a/db/smsmapper.php
+++ b/db/smsmapper.php
@@ -33,7 +33,7 @@ class SmsMapper extends Mapper {
 	}
 
 	public function getAllIds ($userId) {
-		$query = \OC_DB::prepare('SELECT sms_id, sms_mailbox FROM ' .
+		$query = \OCP\DB::prepare('SELECT sms_id, sms_mailbox FROM ' .
 		'*PREFIX*ocsms_smsdatas WHERE user_id = ?');
 		$result = $query->execute(array($userId));
 
@@ -52,7 +52,7 @@ class SmsMapper extends Mapper {
 	}
 
 	public function getAllPeersPhoneNumbers ($userId) {
-		$query = \OC_DB::prepare('SELECT sms_address FROM ' .
+		$query = \OCP\DB::prepare('SELECT sms_address FROM ' .
 		'*PREFIX*ocsms_smsdatas WHERE user_id = ? AND sms_mailbox IN (?,?)');
 		$result = $query->execute(array($userId, 0, 1));
 
@@ -66,7 +66,7 @@ class SmsMapper extends Mapper {
 	}
 
 	public function getAllMessagesForPhoneNumber ($userId, $phoneNumber, $minDate = 0) {
-		$query = \OC_DB::prepare('SELECT sms_date, sms_msg, sms_type FROM ' .
+		$query = \OCP\DB::prepare('SELECT sms_date, sms_msg, sms_type FROM ' .
 		'*PREFIX*ocsms_smsdatas WHERE user_id = ? AND sms_address = ? ' .
 		'AND sms_mailbox IN (?,?) AND sms_date > ?');
 		$result = $query->execute(array($userId, $phoneNumber, 0, 1, $minDate));
@@ -86,7 +86,7 @@ class SmsMapper extends Mapper {
 		\OCP\DB::beginTransaction();
 
 		if ($purgeAllSmsBeforeInsert === true) {
-			$query = \OC_DB::prepare('DELETE FROM *PREFIX*ocsms_smsdatas ' .
+			$query = \OCP\DB::prepare('DELETE FROM *PREFIX*ocsms_smsdatas ' .
 			'WHERE user_id = ?');
 			$result = $query->execute(array($userId));
 		}
@@ -101,14 +101,14 @@ class SmsMapper extends Mapper {
 			if ($purgeAllSmsBeforeInsert === false) {
 				// Remove previous record
 				// @ TODO: only update the required fields, getAllIds can be useful
-				$query = \OC_DB::prepare('DELETE FROM *PREFIX*ocsms_smsdatas ' .
+				$query = \OCP\DB::prepare('DELETE FROM *PREFIX*ocsms_smsdatas ' .
 				'WHERE user_id = ? AND sms_id = ?');
 				$result = $query->execute(array(
 					$userId, (int) $sms["_id"]
 				));
 			}
 
-			$query = \OC_DB::prepare('INSERT INTO *PREFIX*ocsms_smsdatas ' .
+			$query = \OCP\DB::prepare('INSERT INTO *PREFIX*ocsms_smsdatas ' .
 			'(user_id, added, lastmodified, sms_flags, sms_date, sms_id,' .
 			'sms_address, sms_msg, sms_mailbox, sms_type) VALUES ' .
 			'(?,?,?,?,?,?,?,?,?,?)');
diff --git a/js/script.js b/js/script.js
index 15d5eef..bc95e9a 100644
--- a/js/script.js
+++ b/js/script.js
@@ -25,6 +25,11 @@ $.urlParam = function(name){
 };
 
 var refreshConversation = function() {
+	// if no conversation selected, then don't fetch page
+	if (curPhoneNumber == null) {
+		return;
+	}
+	
 	$.getJSON(OC.generateUrl('/apps/ocsms/get/conversation'),
 		{
 			'phoneNumber': curPhoneNumber,
@@ -152,18 +157,25 @@ function changeSelectedConversation(item) {
 				OC.Util.History.pushState('phonenumber=' + phoneNumber);
 				// Reset it for refreshConversation
 				lastMsgDate = 0;
-				fetchConversation(phoneNumber);
-				changeSelectedConversation($(this));
+				
+				// phoneNumber must exist
+				if (phoneNumber != null) {
+					fetchConversation(phoneNumber);
+					changeSelectedConversation($(this));
+				}
 				event.preventDefault();
 			});
 
-			var urlPhoneNumber = decodeURIComponent($.urlParam('phonenumber'));
-			if (urlPhoneNumber != null) {
-				fetchConversation(urlPhoneNumber);
+			var pnParam = $.urlParam('phonenumber'));
+			if (pnParam != null) {
+				var urlPhoneNumber = decodeURIComponent(pnParam);
+				if (urlPhoneNumber != null) {
+					fetchConversation(urlPhoneNumber);
 
-				var pObject = $("a[mailbox-navigation='" + urlPhoneNumber + "']");
-				if (pObject != null) {
-					changeSelectedConversation(pObject);
+					var pObject = $("a[mailbox-navigation='" + urlPhoneNumber + "']");
+					if (pObject != null) {
+						changeSelectedConversation(pObject);
+					}
 				}
 			}
 	     });