diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/Navigator.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/Navigator.java
index e4ee5657b..9e7ee6dc0 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/Navigator.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/Navigator.java
@@ -17,9 +17,7 @@
  */
 package org.jackhuang.hmcl.ui.construct;
 
-import javafx.application.Platform;
 import javafx.beans.property.ObjectProperty;
-import javafx.beans.property.ReadOnlyBooleanWrapper;
 import javafx.beans.property.SimpleObjectProperty;
 import javafx.event.Event;
 import javafx.event.EventHandler;
@@ -40,19 +38,23 @@ public class Navigator extends StackPane {
 
     private final Stack<Node> stack = new Stack<>();
     private final TransitionHandler animationHandler = new TransitionHandler(this);
-    private final ReadOnlyBooleanWrapper canGoBack = new ReadOnlyBooleanWrapper();
+    private boolean initialized = false;
 
-    public Navigator(Node init) {
+    public void init(Node init) {
         stack.push(init);
         getChildren().setAll(init);
 
-        Platform.runLater(() ->
-                fireEvent(new NavigationEvent(this, init, NavigationEvent.NAVIGATED)));
+        fireEvent(new NavigationEvent(this, init, NavigationEvent.NAVIGATED));
+
+        initialized = true;
     }
 
     public void navigate(Node node) {
         FXUtils.checkFxUserThread();
 
+        if (!initialized)
+            throw new IllegalStateException("Navigator must have a root page");
+
         Node from = stack.peek();
         if (from == node)
             return;
@@ -89,6 +91,9 @@ public class Navigator extends StackPane {
     public void close(Node from) {
         FXUtils.checkFxUserThread();
 
+        if (!initialized)
+            throw new IllegalStateException("Navigator must have a root page");
+
         Logging.LOG.info("Closed page " + from);
 
         if (stack.peek() != from)
diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/decorator/DecoratorController.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/decorator/DecoratorController.java
index ce032de89..b4ae5c6e8 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/ui/decorator/DecoratorController.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/decorator/DecoratorController.java
@@ -84,9 +84,10 @@ public class DecoratorController {
         decorator.titleProperty().set(Metadata.TITLE);
         decorator.setOnCloseButtonAction(Launcher::stopApplication);
 
-        navigator = new Navigator(mainPage);
+        navigator = new Navigator();
         navigator.setOnNavigating(this::onNavigating);
         navigator.setOnNavigated(this::onNavigated);
+        navigator.init(mainPage);
 
         decorator.getContent().setAll(navigator);
         decorator.onCloseNavButtonActionProperty().set(e -> close());