diff --git a/lib/Browser.js b/lib/Browser.js
index b9df27d..1491d06 100644
--- a/lib/Browser.js
+++ b/lib/Browser.js
@@ -110,7 +110,7 @@ Browser.prototype.stop = function () {
   // because resolver.stop()'s will trigger serviceDown:
   this.removeAllListeners('serviceDown');
   Object.values(this._resolvers).forEach(function (resolver) {
-    return resolver.stop();
+    return resolver && resolver.stop();
   });
 
   this._state = STATE.STOPPED;
@@ -258,4 +258,4 @@ Browser.prototype._addService = function (answer, additionals) {
   resolver.start(additionals);
 };
 
-module.exports = Browser;
\ No newline at end of file
+module.exports = Browser;
diff --git a/src/Browser.js b/src/Browser.js
index 097d591..31915fc 100644
--- a/src/Browser.js
+++ b/src/Browser.js
@@ -104,7 +104,7 @@ Browser.prototype.stop = function() {
 
   // because resolver.stop()'s will trigger serviceDown:
   this.removeAllListeners('serviceDown');
-  Object.values(this._resolvers).forEach(resolver => resolver.stop());
+  Object.values(this._resolvers).forEach(resolver => resolver && resolver.stop());
 
   this._state = STATE.STOPPED;
   this._resolvers = {};