diff --git a/package.json b/package.json
index 3671548..efa9dd5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "http2-wrapper",
-	"version": "2.1.5",
+	"version": "2.1.6",
 	"description": "HTTP2 client, just with the familiar `https` API",
 	"main": "source",
 	"types": "index.d.ts",
diff --git a/source/auto.js b/source/auto.js
index d1d90e4..6085d0d 100644
--- a/source/auto.js
+++ b/source/auto.js
@@ -124,7 +124,7 @@ module.exports = async (input, options, callback) => {
 
 	options.host = options.hostname || options.host || 'localhost';
 	options.session = options.tlsSession;
-	options.servername = options.servername || calculateServerName(options.headers?.host || options.host);
+	options.servername = options.servername || calculateServerName((options.headers && options.headers.host) || options.host);
 	options.port = options.port || (isHttps ? 443 : 80);
 	options._defaultAgent = isHttps ? https.globalAgent : http.globalAgent;