diff --git a/lib/plugins/core/StudIPPlugin.php b/lib/plugins/core/StudIPPlugin.php
index a747119c8a14b51550648675c570a20498584752..8389859b53b6427d1df2a54f8de3f7df9c1e181d 100644
--- a/lib/plugins/core/StudIPPlugin.php
+++ b/lib/plugins/core/StudIPPlugin.php
@@ -225,7 +225,7 @@ abstract class StudIPPlugin
             return function ($request, $response, array $otherargs) use ($action, $args, $that) {
                 ob_start();
                 call_user_func_array([$that, $action], $args);
-                $content = ob_get_contents();
+                $content = ob_get_clean();
                 $response->getBody()->write($content);
                 return $response;
             };