diff --git a/app/controller/Task.php b/app/controller/Task.php
index fc26caf..3bba496 100644
--- a/app/controller/Task.php
+++ b/app/controller/Task.php
@@ -140,7 +140,7 @@ class Task extends BaseController
             $this->json_data['msg'] = '导出类型错误，请选择正确的导出类型';
             return json($this->json_data);
         } else if ($type == 2) {
-			if(trim($params['export_limit']) === ''){
+			if(trim($params['export_limit'] . '') === ''){
 				$this->json_data['code'] = 0;
 				$this->json_data['msg'] = '导出数量必填';
 				return json($this->json_data);