diff --git a/lib/servers/SockJSServer.js b/lib/servers/SockJSServer.js
index 782b325a48..c12913a5a7 100644
--- a/lib/servers/SockJSServer.js
+++ b/lib/servers/SockJSServer.js
@@ -64,7 +64,7 @@ module.exports = class SockJSServer extends BaseServer {
   // f should be passed the resulting connection and the connection headers
   onConnection(f) {
     this.socket.on('connection', (connection) => {
-      f(connection, connection.headers);
+      f(connection, connection ? connection.headers : null);
     });
   }