diff --git a/workflow/engine/controllers/installer.php b/workflow/engine/controllers/installer.php
index 206e1e047..2e0ca8349 100644
--- a/workflow/engine/controllers/installer.php
+++ b/workflow/engine/controllers/installer.php
@@ -337,7 +337,9 @@ class Installer extends Controller
         if (substr( $pathShared, - 1 ) != '/') {
             $pathShared .= '/';
         }
-        $logFile = $pathShared . 'log/install.log';
+        $pathSharedLog =  $pathShared . 'log/';
+        G::verifyPath($pathSharedLog, true);
+        $logFile = $pathSharedLog . 'install.log';
 
         if (! is_file( $logFile )) {
             G::mk_dir( dirname( $pathShared ) );
@@ -839,6 +841,7 @@ class Installer extends Controller
             $updatedConf['default_skin'] = $skinUri;
             $info->uri =  PATH_SEP . 'sys' . $_REQUEST['workspace'] . PATH_SEP . $langUri . PATH_SEP . $skinUri . PATH_SEP . 'login' . PATH_SEP . 'login';
 
+            $indexFileUpdated = true;
             if (defined('PARTNER_FLAG') || isset($_REQUEST['PARTNER_FLAG'])) {
                 $this->buildParternExtras($adminUsername, $adminPassword, $_REQUEST['workspace'], SYS_LANG);
             } else {
diff --git a/workflow/engine/skinEngine/skinEngine.php b/workflow/engine/skinEngine/skinEngine.php
index 7d74c3888..a487aa417 100755
--- a/workflow/engine/skinEngine/skinEngine.php
+++ b/workflow/engine/skinEngine/skinEngine.php
@@ -263,7 +263,7 @@ class SkinEngine
     $meta    = null;
     $dirBody = null;
 
-    if (preg_match("/^.*\(.*MSIE (\d+)\..+\).*$/", $_SERVER["HTTP_USER_AGENT"], $arrayMatch)) {
+    if (isset($_SERVER["HTTP_USER_AGENT"]) && preg_match("/^.*\(.*MSIE (\d+)\..+\).*$/", $_SERVER["HTTP_USER_AGENT"], $arrayMatch)) {
         $ie = intval($arrayMatch[1]);
         $swTrident = (preg_match("/^.*Trident.*$/", $_SERVER["HTTP_USER_AGENT"]))? 1 : 0; //Trident only in IE8+