diff --git a/client/src/main/java/envoy/client/ui/controller/LoginScene.java b/client/src/main/java/envoy/client/ui/controller/LoginScene.java
index 285f3de..30cb205 100644
--- a/client/src/main/java/envoy/client/ui/controller/LoginScene.java
+++ b/client/src/main/java/envoy/client/ui/controller/LoginScene.java
@@ -3,6 +3,7 @@ package envoy.client.ui.controller;
 import java.time.Instant;
 import java.util.logging.*;
 
+import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.geometry.Insets;
 import javafx.scene.control.*;
@@ -126,5 +127,5 @@ public final class LoginScene implements EventListener {
 	}
 
 	@Event
-	private void onHandshakeRejection(HandshakeRejection evt) { new Alert(AlertType.ERROR, evt.get()).showAndWait(); }
+	private void onHandshakeRejection(HandshakeRejection evt) { Platform.runLater(() -> new Alert(AlertType.ERROR, evt.get()).showAndWait()); }
 }