diff --git a/bin/tsw/util/h5-test/is-test.js b/bin/tsw/util/h5-test/is-test.js
index 27b00b6e..90ceba43 100644
--- a/bin/tsw/util/h5-test/is-test.js
+++ b/bin/tsw/util/h5-test/is-test.js
@@ -309,6 +309,10 @@ module.exports.isTestUser = function(req, res) {
     }).done(function(d) {
     }).fail(function(d) {
         logger.error('h5test proxy fail...');
+        if (res.headersSent) {
+            res.end();
+            return;
+        }
         res.setHeader('Content-Type', 'text/html; charset=UTF-8');
         res.writeHead(500);
         res.end();