diff --git a/middleware/utf8.js b/middleware/utf8.js
index cca1a34a8..c513eb2da 100644
--- a/middleware/utf8.js
+++ b/middleware/utf8.js
@@ -2,5 +2,5 @@
 // https://stackoverflow.com/questions/1497885/remove-control-characters-from-php-string/1497928#1497928
 module.exports = async (ctx, next) => {
     await next();
-    ctx.body = ctx.body.replace(/[\x00-\x1F\x7F]/g, '');
+    ctx.body = ctx.body?ctx.body.replace(/[\x00-\x1F\x7F]/g, ''):ctx.body;
 };