修复导出功能在部分环境可能会出现异常问题

src/Grid/Exporters/ExcelExporter.php

@@ -36,6 +36,6 @@ class ExcelExporter extends AbstractExporter
 
         $exporter->headings($this->titles())->download($filename);
 
-        admin_exit();
+        exit;
     }
 }