diff --git a/index.js b/index.js
index f9894aa..765b705 100644
--- a/index.js
+++ b/index.js
@@ -47,6 +47,9 @@ function middlewareExists(app, name) {
 	//From http://stackoverflow.com/questions/26304234/check-if-a-given-middleware-is-being-used
 	//filter checks each element, and !! converts filter's return type (an array of booleans) to 
 	//a boolean type
+    if (!app._router) {
+        return false
+    }
 	return !!app._router.stack.filter(function (layer) { 
 		return layer && layer.handle && layer.handle.name === name; 
     }).length;