diff --git a/proxy.js b/proxy.js
index 14efcfc..5cba14a 100644
--- a/proxy.js
+++ b/proxy.js
@@ -26,7 +26,7 @@ const params = {
 
 certFile ? serveTls(handle, params) : serve(handle, params)
 const authString = auth ? Deno.readTextFileSync(auth) : ''
-const users = authString.match(/^(\w|:)+/gm)
+const users = authString.match(/^(\w|:)+/gm) || []
 if(auth) {
     certFile || console.warn('[Warning] pass basic authorization in HTTP is unsafely, please consider use HTTPS')
     console.info(`load ${users.length} valid user`)