fix get _id

app/Http/Controllers/Controller.php

@@ -18,7 +18,7 @@ class Controller extends BaseController
 
         $result = array();
         $untaggedform = Form::where('customer_category', null)->get();
-        $work_order = WorkOrder::where('_id', $untaggedform->_id)->get();
+        $work_order = WorkOrder::where('_id', $untaggedform->id)->get();
 
         foreach ($work_order as $key => $wo) {
             array_push($result, array(