diff --git a/main/inc/ajax/chat.ajax.php b/main/inc/ajax/chat.ajax.php
index 165e748540..352ee418bc 100755
--- a/main/inc/ajax/chat.ajax.php
+++ b/main/inc/ajax/chat.ajax.php
@@ -1,5 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
+
 /**
  * Responses to AJAX calls
  */
@@ -11,49 +12,49 @@ require_once '../global.inc.php';
 $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : null;
 
 if (api_is_anonymous()) {
-	exit;
+    exit;
 }
 
 if (api_get_setting('allow_global_chat') == 'false') {
-	exit;
+    exit;
 }
 
 $to_user_id = isset($_REQUEST['to']) ? $_REQUEST['to'] : null;
 $message	= isset($_REQUEST['message']) ? $_REQUEST['message'] : null;
 
 if (!isset($_SESSION['chatHistory'])) {
-	$_SESSION['chatHistory'] = array();
+    $_SESSION['chatHistory'] = array();
 }
 
 if (!isset($_SESSION['openChatBoxes'])) {
-	$_SESSION['openChatBoxes'] = array();
+    $_SESSION['openChatBoxes'] = array();
 }
 
 $chat = new Chat();
 if ($chat->is_chat_blocked_by_exercises()) {
-    //Desconnecting the user
+    //Disconnecting the user
     $chat->set_user_status(0);
     exit;
 }
 
 switch ($action) {
-	case 'chatheartbeat':
-		$chat->heartbeat();
-		break;
-	case 'closechat':
-		$chat->close();
-		break;
-	case 'sendchat':
-		$chat->send(api_get_user_id(), $to_user_id, $message);
-		break;
-	case 'startchatsession':
-		$chat->start_session();
-		break;
+    case 'chatheartbeat':
+        $chat->heartbeat();
+        break;
+    case 'closechat':
+        $chat->close();
+        break;
+    case 'sendchat':
+        $chat->send(api_get_user_id(), $to_user_id, $message);
+        break;
+    case 'startchatsession':
+        $chat->start_session();
+        break;
     case 'set_status':
         $status = isset($_REQUEST['status']) ? intval($_REQUEST['status']) : 0;
-		$chat->set_user_status($status);
-		break;
-	default:
+        $chat->set_user_status($status);
+        break;
+    default:
         echo '';
 }
-exit;
\ No newline at end of file
+exit;