diff --git a/includes/auth_integration/phpbb.php b/includes/auth_integration/phpbb.php
index de778de..766741e 100755
--- a/includes/auth_integration/phpbb.php
+++ b/includes/auth_integration/phpbb.php
@@ -27,7 +27,7 @@ function kleeja_auth_login ($name, $pass, $hashed = false, $expire, $loginadm =
     global $lang, $config, $usrcp, $userinfo;
     global $script_path, $script_encoding, $script_srv, $script_db, $script_user, $script_pass, $script_prefix;
 
-    //check for last slash / 
+    //check for last slash /
     if (isset($script_path))
     {
         if (isset($script_path[strlen($script_path)]) && $script_path[strlen($script_path)] == '/')
@@ -76,7 +76,7 @@ function kleeja_auth_login ($name, $pass, $hashed = false, $expire, $loginadm =
         return;
     }
 
-    //conecting ...        
+    //conecting ...
     $SQLBB = new KleejaDatabase($forum_srv, $forum_user, $forum_pass, $forum_db, true);
 
     $SQLBB->set_names('utf8');
@@ -91,7 +91,7 @@ function kleeja_auth_login ($name, $pass, $hashed = false, $expire, $loginadm =
     include_once PATH . $script_path . '/includes/utf/utf_tools.' . $phpEx;
 
     $row_leve    = 'user_type';
-    $admin_level = 3;                    
+    $admin_level = 3;
     $query2      = [
         'SELECT'       => '*',
         'FROM'         => "`{$forum_prefix}users`",
@@ -109,7 +109,7 @@ function kleeja_auth_login ($name, $pass, $hashed = false, $expire, $loginadm =
 
     if (! $hashed)
     {
-        $result2 = $SQLBB->build($query2);                    
+        $result2 = $SQLBB->build($query2);
         while ($row=$SQLBB->fetch_array($result2))
         {
             $SQLBB->freeresult($result2); 
@@ -169,11 +169,11 @@ function kleeja_auth_login ($name, $pass, $hashed = false, $expire, $loginadm =
                 if (! $hashed && ! $loginadm)
                 {
                     $usrcp->kleeja_set_cookie('ulogu', $usrcp->en_de_crypt(
-                                                    $row['user_id'] . '|' . 
-                                                    $row['user_password'] . '|' . 
-                                                    $expire . '|' . 
-                                                    sha1(md5($config['h_key'] . $row['user_password']) . $expire) . '|' . 
-                                                    ($row[$row_leve] == $admin_level ? '1' : '3') . '|' . 
+                                                    $row['user_id'] . '|' .
+                                                    $row['user_password'] . '|' .
+                                                    $expire . '|' .
+                                                    sha1(md5($config['h_key'] . $row['user_password']) . $expire) . '|' .
+                                                    ($row[$row_leve] == $admin_level ? '1' : '3') . '|' .
                                                     $user_y
                                             ), $expire);
                 }
@@ -183,14 +183,14 @@ function kleeja_auth_login ($name, $pass, $hashed = false, $expire, $loginadm =
             else
             {
                 //he is banned from phpBB
-                $SQLBB->freeresult($result);   
+                $SQLBB->freeresult($result);
                 unset($pass);
                 $SQLBB->close();
                 return false;
             }
         }
 
-        $SQLBB->freeresult($result);   
+        $SQLBB->freeresult($result);
         unset($pass);
         $SQLBB->close();
         return true;
diff --git a/includes/common.php b/includes/common.php
index ef33469..64dc7c3 100755
--- a/includes/common.php
+++ b/includes/common.php
@@ -162,7 +162,7 @@ if (empty($script_encoding))
 }
 
 //start classes ..
-$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
 //no need after now
 unset($dbpass);
 
diff --git a/includes/functions.php b/includes/functions.php
index d74824a..db69801 100755
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -796,7 +796,7 @@ function update_config($name, $value, $escape = true, $group = false)
 {
     global $SQL, $dbprefix, $d_groups, $userinfo;
 
-    $value = ($escape) ? $SQL->escape($value) : $value;
+    $value = $escape ? $SQL->escape($value) : $value;
     $table = "{$dbprefix}config";
 
     //what if this config is a group-configs related ?
diff --git a/includes/mysqli.php b/includes/mysqli.php
index 0a112e0..f8c8bca 100755
--- a/includes/mysqli.php
+++ b/includes/mysqli.php
@@ -20,30 +20,34 @@ define('SQL_LAYER', 'mysqli');
 
 class KleejaDatabase
 {
-    public $connect_id        = null;
-    public $result;
-    public $query_num               = 0;
-    public $in_transaction          = 0;
-    public $debugr                  = false;
-    public $show_errors             = true;
+    private $connect_id               = null;
+    private $result                   = null;
+    public $dbprefix                 = '';
+    private $dbname                   = '';
+    public $query_num                = 0;
+    private $in_transaction           = 0;
+    public $debugr                   = false;
+    private $show_errors              = true;
 
 
     /*
      * initiate the class
      * with basic data
     */
-    public function __construct($host, $db_username, $db_password, $db_name, $new_link = false)
+    public function __construct($host, $db_username, $db_password, $db_name, $dbprefix)
     {
-        global $script_encoding;
+        $port  = 3306;
 
-        $host     .= strpos($host, ':') !== false ? '' : ':';
-        $this->host               = substr($host, 0, strpos($host, ':'));
-        $this->port               = (int) substr($host, strpos($host, ':')+1);
-        $this->db_username        = $db_username;
-        $this->db_name            = $db_name;
-        $this->db_password        = 'hidden';
+        if (strpos($host, ':') !== false)
+        {
+            $host = substr($host, 0, strpos($host, ':'));
+            $port = (int) substr($host, strpos($host, ':')+1);
+        }
 
-        $this->connect_id = @mysqli_connect($this->host, $this->db_username, $db_password, $this->db_name, (! $this->port ? 3306 : $this->port));
+        $this->dbprefix        = $dbprefix;
+        $this->dbname        = $db_name;
+
+        $this->connect_id = @mysqli_connect($host, $db_username, $db_password, $db_name, $port);
 
         //no error
         if (defined('MYSQL_NO_ERRORS'))
@@ -56,19 +60,18 @@ class KleejaDatabase
         {
             //loggin -> no database -> close connection
             $this->close();
-            $this->error_msg('we can not connect to the server ...');
+            $this->error_msg('We can not connect to the server ...');
             return false;
         }
 
-        //loggin -> connecting
+        //connecting
         kleeja_log('[Connected] : ' . kleeja_get_page());
 
 
-        if ((! preg_match('/utf/i', strtolower($script_encoding)) && ! defined('IN_LOGINPAGE') && ! defined('IN_ADMIN_LOGIN') && ! defined('DISABLE_INTR')) || (empty($script_encoding) || preg_match('/utf/i', strtolower($script_encoding)) || defined('DISABLE_INTR')))
+        if (! defined('DISABLE_MYSQL_UTF8'))
         {
             if (mysqli_set_charset($this->connect_id, 'utf8'))
             {
-                //loggin -> set utf8
                 kleeja_log('[Set to UTF8] : --> ');
             }
         }
@@ -413,7 +416,6 @@ class KleejaDatabase
     // error message func
     public function error_msg($msg)
     {
-        global $dbprefix;
 
         if (! $this->show_errors)
         {
@@ -427,10 +429,10 @@ class KleejaDatabase
         //some ppl want hide their table names
         if (! defined('DEV_STAGE'))
         {
-            $error_sql = preg_replace_callback("#\s{1,3}`*{$dbprefix}([a-z0-9]+)`*\s{1,3}#", function($m) {
-                return '<span style="color:blue">' . substr($m[1], 0, 1) . '</span>';
+            $error_sql = preg_replace_callback("#\s{1,3}`*{$this->dbprefix}([a-z0-9]+)`*\s{1,3}#", function($m) {
+                return ' <span style="color:blue">' . substr($m[1], 0, 1) . '</span> ';
             }, $error_sql);
-            $error_msg = preg_replace_callback("#{$this->db_name}.{$dbprefix}([a-z0-9]+)#", function($m) {
+            $error_msg = preg_replace_callback("#{$this->dbname}.{$this->dbprefix}([a-z0-9]+)#", function($m) {
                 return ' <span style="color:blue">' . substr($m[1], 0, 1) . '</span> ';
             }, $error_msg);
             $error_sql = preg_replace_callback("#\s{1,3}(from|update|into)\s{1,3}([a-z0-9]+)\s{1,3}#i", function($m) {
@@ -459,7 +461,7 @@ class KleejaDatabase
         $error_message .= '<br />';
         $error_message .= '<div class="error">';
         $error_message .= " <a href='#' onclick='window.location.reload( false );'>click to Refresh this page ...</a><br />";
-        $error_message .= '<h2>Sorry , We encounter a MySQL error: ' . ($msg !='' ? $msg : '') . '</h2>';
+        $error_message .= '<h2>Sorry , We encountered a MySQL error: ' . ($msg !='' ? $msg : '') . '</h2>';
 
         if ($error_sql != '')
         {
diff --git a/includes/usr.php b/includes/usr.php
index 56ccd8b..fdef041 100755
--- a/includes/usr.php
+++ b/includes/usr.php
@@ -17,20 +17,14 @@ if (! defined('IN_COMMON'))
 
 class usrcp
 {
-    // this function like a traffic sign :)
     public function data ($name, $pass, $hashed = false, $expire = 86400, $loginadm = false)
     {
         global $config, $userinfo;
 
-        //return user system to normal
-        if (defined('DISABLE_INTR') || $config['user_system'] == '' || empty($config['user_system']))
-        {
-            $config['user_system'] = '1';
-        }
-
-
         //expire
         $expire = time() + ((int) $expire ? intval($expire) : 86400);
+        $name  = trim($name);
+        $pass  = trim($pass);
 
         $return_now = $login_status = false;
 
@@ -42,19 +36,8 @@ class usrcp
         }
 
 
-        if ((int) $config['user_system'] != 1)
-        {
-            if (file_exists(PATH . 'includes/auth_integration/' . trim($config['user_system']) . '.php'))
-            {
-                include_once PATH . 'includes/auth_integration/' . trim($config['user_system']) . '.php';
-                $login_status = kleeja_auth_login(trim($name), trim($pass), $hashed, $expire, $loginadm);
-
-                return $login_status;
-            }
-        }
-
         //normal
-        return $this->normal(trim($name), trim($pass), $hashed, $expire, $loginadm);
+        return $this->normal($name, $pass, $hashed, $expire, $loginadm);
     }
 
     //get username by id
@@ -62,12 +45,6 @@ class usrcp
     {
         global $config;
 
-        //return user system to normal
-        if (defined('DISABLE_INTR'))
-        {
-            $config['user_system'] = 1;
-        }
-
         $return_now = $auth_status = false;
 
         is_array($plugin_run_result = Plugins::getInstance()->run('auth_func_usr_class', get_defined_vars())) ? extract($plugin_run_result) : null; //run hook
@@ -77,22 +54,13 @@ class usrcp
             return $auth_status;
         }
 
-        if ((int) $config['user_system'] != 1)
-        {
-            if (file_exists(PATH . 'includes/auth_integration/' . trim($config['user_system']) . '.php'))
-            {
-                include_once PATH . 'includes/auth_integration/' . trim($config['user_system']) . '.php';
-                return kleeja_auth_username($user_id);
-            }
-        }
-
         //normal system
         $u = $this->get_data('name', $user_id);
         return $u['name'];
     }
 
     //now our table, normal user system
-    public function normal ($name, $pass, $hashed = false, $expire, $loginadm = false)
+    public function normal($name, $pass, $hashed = false, $expire, $loginadm = false)
     {
         global $SQL, $dbprefix, $config, $userinfo;
 
diff --git a/install/includes/functions_install.php b/install/includes/functions_install.php
index 1d47b89..85b278c 100755
--- a/install/includes/functions_install.php
+++ b/install/includes/functions_install.php
@@ -168,7 +168,7 @@ function inst_get_config($name)
             return false;
         }
 
-        $SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+        $SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
     }
 
     if (empty($SQL))
diff --git a/install/includes/install_sqls.php b/install/includes/install_sqls.php
index 45896fb..cc095f6 100755
--- a/install/includes/install_sqls.php
+++ b/install/includes/install_sqls.php
@@ -101,18 +101,18 @@ $install_sqls['files'] = "
 CREATE TABLE `{$dbprefix}files` (
   `id` int(11) unsigned NOT NULL auto_increment,
   `last_down` int(11) unsigned NOT NULL DEFAULT '0',
-  `name` varchar(300) collate utf8_bin NOT NULL,
-  `real_filename` VARCHAR( 350 ) collate utf8_bin NOT NULL,
+  `name` varchar(300) collate utf8_bin NOT NULL DEFAULT '',
+  `real_filename` VARCHAR( 350 ) collate utf8_bin NOT NULL DEFAULT '',
   `size` bigint(20) unsigned NOT NULL DEFAULT '0',
   `uploads` int(11) unsigned NOT NULL DEFAULT '0',
-  `time` int(11) unsigned NOT NULL,
+  `time` int(11) unsigned NOT NULL DEFAULT '0',
   `type` varchar(20) collate utf8_bin NOT NULL,
   `folder` varchar(100) collate utf8_bin NOT NULL,
   `report` int(11) unsigned  NOT NULL DEFAULT '0',
   `user` int(11)  NOT NULL default '-1',
-  `code_del` varchar(150) collate utf8_bin NOT NULL,
-  `user_ip` VARCHAR( 250 ) NOT NULL,
-  `id_form` VARCHAR( 100 ) NOT NULL,
+  `code_del` varchar(150) collate utf8_bin NOT NULL DEFAULT '',
+  `user_ip` VARCHAR( 250 ) NOT NULL DEFAULT '',
+  `id_form` VARCHAR( 100 ) NOT NULL DEFAULT 'id',
   PRIMARY KEY (`id`),
   KEY `name` (`name`(300)),
   KEY `user` (`user`),
@@ -128,8 +128,8 @@ CREATE TABLE `{$dbprefix}files` (
 $install_sqls['config'] = "
 CREATE TABLE `{$dbprefix}config` (
   `name` varchar(255) collate utf8_bin NOT NULL,
-  `value` varchar(255) collate utf8_bin NOT NULL,
-  `option` mediumtext collate utf8_bin  NOT NULL,
+  `value` varchar(255) collate utf8_bin NOT NULL DEFAULT '',
+  `option` mediumtext collate utf8_bin  NOT NULL DEFAULT '',
   `display_order` int(10)  NOT NULL DEFAULT '1',
   `type` varchar(20) NULL DEFAULT 'other',
   `plg_id` int(11) NOT NULL DEFAULT '0',
@@ -157,16 +157,16 @@ CREATE TABLE `{$dbprefix}config` (
 $install_sqls['plugins'] = "
 CREATE TABLE `{$dbprefix}plugins` (
   `plg_id` int(11) unsigned NOT NULL auto_increment,
-  `plg_name` varchar(255) collate utf8_bin NOT NULL,
+  `plg_name` varchar(255) collate utf8_bin NOT NULL DEFAULT '',
   `plg_ver` varchar(255) collate utf8_bin NOT NULL,
-  `plg_author` varchar(255) collate utf8_bin NOT NULL,
-  `plg_dsc` mediumtext COLLATE utf8_bin NOT NULL,
-  `plg_icon` blob NOT NULL,
-  `plg_uninstall` mediumtext COLLATE utf8_bin NOT NULL,
+  `plg_author` varchar(255) collate utf8_bin NOT NULL DEFAULT '',
+  `plg_dsc` mediumtext COLLATE utf8_bin NOT NULL DEFAULT '',
+  `plg_icon` blob NOT NULL DEFAULT '',
+  `plg_uninstall` mediumtext COLLATE utf8_bin NOT NULL DEFAULT '',
   `plg_disabled` tinyint(1) unsigned NOT NULL default '0',
-  `plg_instructions` mediumtext COLLATE utf8_bin NOT NULL,
-  `plg_store` longtext COLLATE utf8_bin NOT NULL,
-  `plg_files` text COLLATE utf8_bin NOT NULL,
+  `plg_instructions` mediumtext COLLATE utf8_bin NOT NULL DEFAULT '',
+  `plg_store` longtext COLLATE utf8_bin NOT NULL DEFAULT '',
+  `plg_files` text COLLATE utf8_bin NOT NULL DEFAULT '',
   PRIMARY KEY (`plg_id`),
   KEY `plg_name` (`plg_name`)
 ) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_bin ;
@@ -174,9 +174,9 @@ CREATE TABLE `{$dbprefix}plugins` (
 
 $install_sqls['lang'] = "
 CREATE TABLE `{$dbprefix}lang` (
-  `word` varchar(255) collate utf8_bin NOT NULL,
-  `trans` varchar(255) collate utf8_bin NOT NULL,
-  `lang_id` varchar(100) COLLATE utf8_bin NOT NULL,
+  `word` varchar(255) collate utf8_bin NOT NULL ,
+  `trans` varchar(255) collate utf8_bin NOT NULL DEFAULT '',
+  `lang_id` varchar(100) COLLATE utf8_bin NOT NULL DEFAULT 'en',
   `plg_id` int(11) unsigned NOT NULL DEFAULT '0',
   KEY `lang_id` (`lang_id`),
   KEY `plg_id` (`plg_id`),
@@ -198,7 +198,7 @@ $install_sqls['groups_data'] = "
 CREATE TABLE `{$dbprefix}groups_data` (
   `group_id` int(11) unsigned NOT NULL,
   `name` varchar(255) COLLATE utf8_bin NOT NULL,
-  `value` varchar(255) COLLATE utf8_bin NOT NULL,
+  `value` varchar(255) COLLATE utf8_bin NOT NULL DEFAULT '',
   KEY `group_id` (`group_id`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 ";
diff --git a/install/install.php b/install/install.php
index 6598ccf..74e99d0 100755
--- a/install/install.php
+++ b/install/install.php
@@ -140,7 +140,7 @@ case 'check':
     if (! empty($dbname) && ! empty($dbuser))
     {
         //connect .. for check
-        $SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+        $SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
 
 
         if (! $SQL->is_connected())
@@ -202,7 +202,7 @@ case 'data' :
         }
 
         //connect .. for check
-        $SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+        $SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
 
         include_once PATH . 'includes/usr.php';
         include_once PATH . 'includes/functions_alternative.php';
diff --git a/install/quick.php b/install/quick.php
index a376ea1..c3baa50 100644
--- a/install/quick.php
+++ b/install/quick.php
@@ -49,7 +49,7 @@ else
     exit('`config.php` was missing! so we created one for you, kindly edit the file with database information.');
 }
 
-$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
 
 if (! $SQL->is_connected())
 {
@@ -76,7 +76,7 @@ foreach (['cache', 'uploads', 'uploads/thumbs'] as $folder)
 
 
 //install
-$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
 
 include_once PATH . 'includes/usr.php';
 include_once PATH . 'includes/functions_alternative.php';
diff --git a/install/update.php b/install/update.php
index 30b4213..e6209b4 100755
--- a/install/update.php
+++ b/install/update.php
@@ -34,7 +34,7 @@ include_once 'includes/functions_install.php';
 include_once 'includes/update_schema.php';
 
 
-$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname);
+$SQL = new KleejaDatabase($dbserver, $dbuser, $dbpass, $dbname, $dbprefix);
 
 //
 // fix missing db_version
diff --git a/lang/ar/common.php b/lang/ar/common.php
index cc98b76..2b2e346 100755
--- a/lang/ar/common.php
+++ b/lang/ar/common.php
@@ -191,9 +191,6 @@ return [
     'NOT_SAFE_FILE'                               => 'نظام كليجا  اكتشف أن  الملف "%s" غير آمن  ويحتوي على أكواد خبيثه  .. !!',
     'ARE_YOU_SURE_DO_THIS'                        => 'هل أنت متأكد من القيام بهذه العملية؟',
     'SITE_FOR_MEMBER_ONLY'                        => 'المركز للأعضاء فقط ، قم بالتسجيل أو بالدخول حتى تتمكن من التحميل.',
-    'AUTH_INTEGRATION_N_UTF8_T'                   => '%s ليست utf8',
-    'AUTH_INTEGRATION_N_UTF8'                     => '%s يجب أن يكون ترميز قاعدة البيانات الخاصة به utf8 لكي يتم الربط مع كليجا!.',
-    'SCRIPT_AUTH_PATH_WRONG'                      => 'مسار السكربت %s الذي تم ربط عضويات كليجا معه خاطئ ,قم بضبطه',
     'SHOW_MY_FILECP'                              => 'السماح بعرض ملفاتي',
     'PASS_CHANGE'                                 => 'تغيير كلمة المرور',
     'EDIT_U_AVATER'                               => 'تغيير الصورة الرمزية',
diff --git a/lang/en/common.php b/lang/en/common.php
index f050c6f..48ac639 100755
--- a/lang/en/common.php
+++ b/lang/en/common.php
@@ -187,9 +187,6 @@ return [
     'NOT_SAFE_FILE'                               => 'Kleeja found that the File "%s" is not safe!',
     'ARE_YOU_SURE_DO_THIS'                        => 'Are you sure you want to do this?',
     'SITE_FOR_MEMBER_ONLY'                        => 'This center is only for members, register or login to upload your files.',
-    'AUTH_INTEGRATION_N_UTF8_T'                   => '%s is not utf8',
-    'AUTH_INTEGRATION_N_UTF8'                     => '%s database must be utf8 to be integrated with Kleeja !.',
-    'SCRIPT_AUTH_PATH_WRONG'                      => 'Path of %s is not valid, change it now.',
     'SHOW_MY_FILECP'                              => 'Show my files',
     'PASS_CHANGE'                                 => 'Change password',
     'EDIT_U_AVATER'                               => 'ُEdit your avatar',