diff --git a/mux.go b/mux.go
index 68c4ea5..aabe995 100644
--- a/mux.go
+++ b/mux.go
@@ -59,6 +59,12 @@ func (r *Router) Match(req *http.Request, match *RouteMatch) bool {
 			return true
 		}
 	}
+
+	// Closest match for a router (includes sub-routers)
+	if r.NotFoundHandler != nil {
+		match.Handler = r.NotFoundHandler
+		return true
+	}
 	return false
 }
 
@@ -89,10 +95,7 @@ func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		setCurrentRoute(req, match.Route)
 	}
 	if handler == nil {
-		handler = r.NotFoundHandler
-		if handler == nil {
-			handler = http.NotFoundHandler()
-		}
+		handler = http.NotFoundHandler()
 	}
 	if !r.KeepContext {
 		defer context.Clear(req)
@@ -324,11 +327,15 @@ func CurrentRoute(r *http.Request) *Route {
 }
 
 func setVars(r *http.Request, val interface{}) {
-	context.Set(r, varsKey, val)
+	if val != nil {
+		context.Set(r, varsKey, val)
+	}
 }
 
 func setCurrentRoute(r *http.Request, val interface{}) {
-	context.Set(r, routeKey, val)
+	if val != nil {
+		context.Set(r, routeKey, val)
+	}
 }
 
 // ----------------------------------------------------------------------------