diff --git a/framework/base/helper.class.php b/framework/base/helper.class.php
index 0e5ab9fcf8..1089b8d145 100644
--- a/framework/base/helper.class.php
+++ b/framework/base/helper.class.php
@@ -740,6 +740,19 @@ class baseHelper
 
         session_write_close();
         session_id($sessionID);
+        if(ini_get('session.save_handler') == 'user' and isset($_GET['tid']))
+        {
+            $ztSessionHandler = new ztSessionHandler($_GET['tid']);
+            session_set_save_handler(
+                array($ztSessionHandler, "open"),
+                array($ztSessionHandler, "close"),
+                array($ztSessionHandler, "read"),
+                array($ztSessionHandler, "write"),
+                array($ztSessionHandler, "destroy"),
+                array($ztSessionHandler, "gc")
+            );
+            register_shutdown_function('session_write_close');
+        }
         session_start();
     }
 
diff --git a/framework/base/router.class.php b/framework/base/router.class.php
index b50611fe17..7b25917551 100644
--- a/framework/base/router.class.php
+++ b/framework/base/router.class.php
@@ -3265,13 +3265,13 @@ class ztSessionHandler
         $sessFile = $this->getSessionFile($id);
         if(md5_file($sessFile) == md5($sessData)) return true;
 
-        if(file_put_contents($sessFile, $sessData))
+        if(file_put_contents($sessFile, $sessData, LOCK_EX))
         {
-            if(!file_exists($this->rawFile)) touch($this->rawFile);
+            touch($this->rawFile);
             if(strpos($sessData, 'user|') !== false)
             {
-                $rawSessContent = (string) file_get_contents($this->rawFile);
-                if(strpos($rawSessContent, 'user|') === false) file_put_contents($this->rawFile, $sessData);
+                $rawSessContent = (string) file_get_contents($this->rawFile, false, null, 0, 1024 * 2);
+                if(strpos($rawSessContent, 'user|') === false) file_put_contents($this->rawFile, $sessData, LOCK_EX);
             }
 
             return true;
@@ -3290,9 +3290,10 @@ class ztSessionHandler
     public function destroy($id)
     {
         $sessFile = $this->getSessionFile($id);
-        unlink($sessFile);
-        unlink($this->rawFile);
+        if(file_exists($sessFile)) unlink($sessFile);
+        if(file_exists($this->rawFile)) unlink($this->rawFile);
         touch($sessFile);
+        touch($this->rawFile);
         return true;
     }
 
diff --git a/module/cron/control.php b/module/cron/control.php
index 7b863918b3..4283809823 100644
--- a/module/cron/control.php
+++ b/module/cron/control.php
@@ -186,7 +186,7 @@ class cron extends control
                 /* Skip cron that status is running and run time is less than max. */
                 if($cronInfo->status == 'running' and (time() - strtotime($cronInfo->lastTime)) < $this->config->cron->maxRunTime) continue;
                 /* Skip cron that last time is more than this cron time. */
-                if ('cli' === PHP_SAPI)
+                if('cli' === PHP_SAPI)
                 {
                     if($cronInfo->lastTime >= $cron['time']->format(DT_DATETIME1)) continue;
                 }
@@ -197,10 +197,7 @@ class cron extends control
 
                 if($now > $cron['time'])
                 {
-                    if (!$this->cron->changeStatusRunning($id, $cronInfo->lastTime))
-                    {
-                        continue;
-                    }
+                    if(!$this->cron->changeStatusRunning($id, $cronInfo->lastTime)) continue;
                     $parsedCrons[$id]['time'] = $cron['cron']->getNextRunDate();
 
                     /* Execution command. */
@@ -259,5 +256,4 @@ class cron extends control
         /* Revert cron status to stop. */
         $this->cron->markCronStatus('stop', $configID);
     }
-
 }
diff --git a/module/cron/model.php b/module/cron/model.php
index ef1ec7a580..1b1db8be3d 100644
--- a/module/cron/model.php
+++ b/module/cron/model.php
@@ -98,21 +98,16 @@ class cronModel extends model
      * Change cron status to running
      *
      * @param int    $cronID
-     * @param string $lastTime
      * @access public
-     * @return bool|int
+     * @return bool
      */
-    public function changeStatusRunning($cronID, $lastTime)
+    public function changeStatusRunning($cronID)
     {
         $data = new stdclass();
-        $data->status = 'running';
+        $data->status   = 'running';
         $data->lastTime = date(DT_DATETIME1);
-        $rows = $this->dao->update(TABLE_CRON)->data($data)
-                                              ->where('id')->eq($cronID)
-                                              ->andWhere('status')->ne('running')
-                                              ->andWhere('lastTime')->eq($lastTime)
-                                              ->exec();
-        return dao::isError() ? false : $rows;
+        $this->dao->update(TABLE_CRON)->data($data)->where('id')->eq($cronID)->exec();
+        return !dao::isError();
     }
 
     /**