diff --git a/jpro-sipjs/example/src/main/java/one/jpro/platform/sipjs/example/component/User.java b/jpro-sipjs/example/src/main/java/one/jpro/platform/sipjs/example/component/User.java
index 9b0e4c31..106a0a4a 100644
--- a/jpro-sipjs/example/src/main/java/one/jpro/platform/sipjs/example/component/User.java
+++ b/jpro-sipjs/example/src/main/java/one/jpro/platform/sipjs/example/component/User.java
@@ -117,7 +117,7 @@ public void makeHangupButton() {
             session.set(null);
         });
         session.addListener((observable, oldValue, newValue) -> {
-            button.setDisable(session.get() == null);
+            button.setDisable(session.get() == null || !session.get().stateProperty().get().equals(Session.State.Established));
         });
         button.setDisable(session.get() == null);
         getChildren().add(button);
diff --git a/jpro-sipjs/src/main/java/one/jpro/platform/sipjs/api/session/Session.java b/jpro-sipjs/src/main/java/one/jpro/platform/sipjs/api/session/Session.java
index 7b57a110..d0716e4f 100644
--- a/jpro-sipjs/src/main/java/one/jpro/platform/sipjs/api/session/Session.java
+++ b/jpro-sipjs/src/main/java/one/jpro/platform/sipjs/api/session/Session.java
@@ -89,7 +89,9 @@ public class State {
     }
 
     public void bye() {
-        webapi.executeScript(session.getName() + ".bye();");
+        webapi.js().eval(session.getName() + ".bye();")
+                .toPromise()
+                .onPromiseError(e -> e.printStackTrace());
     }
 
     public void endCall() {