diff --git a/db/zentao.sql b/db/zentao.sql
index adcd98dcc6..0a01d6be19 100755
--- a/db/zentao.sql
+++ b/db/zentao.sql
@@ -669,7 +669,7 @@ CREATE TABLE IF NOT EXISTS `zt_doc` (
   `from` mediumint(8) unsigned NOT NULL DEFAULT '0',
   `fromVersion` smallint(6) NOT NULL DEFAULT '1',
   `draft` longtext NOT NULL,
-  `collector` text NULL,
+  `collects` smallint(5) unsigned NOT NULL DEFAULT '0',
   `addedBy` varchar(30) NOT NULL,
   `addedDate` datetime NOT NULL,
   `assignedTo` varchar(30) NOT NULL DEFAULT '',
diff --git a/module/doc/model.php b/module/doc/model.php
index b20f3b21ec..1665c2bb4a 100644
--- a/module/doc/model.php
+++ b/module/doc/model.php
@@ -3271,7 +3271,7 @@ class docModel extends model
             if($action == 'collect')
             {
                 $collectCount = $this->dao->select('count(*) as count')->from(TABLE_DOCACTION)->where('doc')->eq($docID)->andWhere('action')->eq('collect')->fetch('count');
-                $this->dao->update(TABLE_DOC)->set('collector')->eq($collectCount)->where('id')->eq($docID)->exec();
+                $this->dao->update(TABLE_DOC)->set('collects')->eq($collectCount)->where('id')->eq($docID)->exec();
             }
 
             return $actionID;
@@ -3307,7 +3307,7 @@ class docModel extends model
         if($action->action == 'collect')
         {
             $collectCount = $this->dao->select('count(*) as count')->from(TABLE_DOCACTION)->where('doc')->eq($action->doc)->andWhere('action')->eq('collect')->fetch('count');
-            $this->dao->update(TABLE_DOC)->set('collector')->eq($collectCount)->where('id')->eq($action->doc)->exec();
+            $this->dao->update(TABLE_DOC)->set('collects')->eq($collectCount)->where('id')->eq($action->doc)->exec();
         }
     }
 
diff --git a/module/upgrade/model.php b/module/upgrade/model.php
index 879e69d4cc..dc661007d5 100644
--- a/module/upgrade/model.php
+++ b/module/upgrade/model.php
@@ -9062,6 +9062,16 @@ class upgradeModel extends model
      */
     public function convertDocCollect()
     {
+        $this->saveLogs('Run Method ' . __FUNCTION__);
+        $desc   = $this->dao->query('DESC ' . TABLE_DOC)->fetchAll();
+        $fields = array();
+        foreach($desc as $field)
+        {
+            $fieldName = $field->Field;
+            $fields[$fieldName] = $fieldName;
+        }
+        if(!isset($fields['collector'])) return true;
+
         $this->loadModel('doc');
 
         $users = $this->dao->select('account')->from(TABLE_USER)->fetchPairs('account', 'account');
@@ -9078,7 +9088,7 @@ class upgradeModel extends model
         }
 
         $this->dao->update(TABLE_DOC)->set('collector')->eq(0)->where('collector')->eq('')->exec();
-        $this->dao->exec("ALTER TABLE " . TABLE_DOC . " CHANGE `collector` `collector` smallint NOT NULL DEFAULT '0'");
+        $this->dao->exec("ALTER TABLE " . TABLE_DOC . " CHANGE `collector` `collects` smallint unsigned NOT NULL DEFAULT '0'");
 
         return true;
     }