From d00deb0f545bf3f6ee1a0b69899569b8da13567e Mon Sep 17 00:00:00 2001
From: apolds <simonapold@gmail.com>
Date: Wed, 24 May 2017 07:34:28 +0200
Subject: [PATCH] Allow changing NavigationStateManager (#9416)

Unregister old NavigationStateManager before setting new one (backport of #9410).

Fixes #9406
---
 server/src/main/java/com/vaadin/navigator/Navigator.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/server/src/main/java/com/vaadin/navigator/Navigator.java b/server/src/main/java/com/vaadin/navigator/Navigator.java
index 15936f6168..172ab39928 100644
--- a/server/src/main/java/com/vaadin/navigator/Navigator.java
+++ b/server/src/main/java/com/vaadin/navigator/Navigator.java
@@ -513,6 +513,10 @@ public class Navigator implements Serializable {
         if (stateManager == null) {
             stateManager = new UriFragmentManager(ui.getPage());
         }
+        if (stateManager != null && this.stateManager != null
+                && stateManager != this.stateManager) {
+            this.stateManager.setNavigator(null);
+        }
         this.stateManager = stateManager;
         this.stateManager.setNavigator(this);
         this.display = display;
-- 
2.39.5