diff --git a/module/tree/model.php b/module/tree/model.php
index 5971b0c427..6cb96e74da 100644
--- a/module/tree/model.php
+++ b/module/tree/model.php
@@ -1396,6 +1396,7 @@ class treeModel extends model
 
         $this->fixModulePath($module->root, $module->type);
 
+        if($module->type == 'line')  $this->dao->update(TABLE_PRODUCT)->set('line')->eq('0')->where('line')->eq($moduleID)->exec();
         if($module->type == 'task')  $this->dao->update(TABLE_TASK)->set('module')->eq($module->parent)->where('module')->in($childs)->exec();
         if($module->type == 'bug')   $this->dao->update(TABLE_BUG)->set('module')->eq($module->parent)->where('module')->in($childs)->exec();
         if($module->type == 'case')  $this->dao->update(TABLE_CASE)->set('module')->eq($module->parent)->where('module')->in($childs)->exec();
diff --git a/module/upgrade/model.php b/module/upgrade/model.php
index 4dd59a3924..ab5780e094 100644
--- a/module/upgrade/model.php
+++ b/module/upgrade/model.php
@@ -211,6 +211,7 @@ class upgradeModel extends model
                 $this->execSQL($this->getUpgradeFile('9.8.1'));
                 $this->fixTaskAssignedTo();
                 $this->fixProjectClosedInfo();
+                $this->resetProductLine();
        }
 
         $this->deletePatch();
@@ -2237,4 +2238,17 @@ class upgradeModel extends model
         }
         return !dao::isError();
     }
+
+    /**
+     * Set the value of deleted product line to 0.
+     * 
+     * @access public
+     * @return bool
+     */
+    public function resetProductLine()
+    {
+        $deletedLines = $this->dao->select('id')->from(TABLE_MODULE)->where('type')->eq('line')->andWhere('deleted')->eq('1')->fetchPairs();
+        $this->dao->update(TABLE_PRODUCT)->set('line')->eq(0)->where('line')->in($deletedLines)->exec();
+        return !dao::isError();
+    }
 }