diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 7468f2a..bfe506a 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -177,7 +177,7 @@ public function viewTaskList(RequestAbstract $request, ResponseAbstract $respons
             ->limit(25)
             ->paginate(
                 'id',
-                $request->getData('ptype'),
+                $request->getDataString('ptype'),
                 $request->getDataInt('offset')
             )
             ->executeGetArray();