diff --git a/lib/server.js b/lib/server.js
index 8aca3d8..c167e7c 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -111,6 +111,10 @@ Server.prototype.getParameters = function () {
 }
 
 Server.prototype.start = function () {
+  if (this.instance) {
+    return this
+  }
+
   var parameters = this.getParameters()
   var server = new ArmaServer.Server({
     admins: config.admins,