diff --git a/example.js b/example.js
index 6e02976a..37f42410 100644
--- a/example.js
+++ b/example.js
@@ -4,8 +4,8 @@ var telegramChatId = 'put your telegram chat id here';
 
 function sendMessage(message) {
     var url = 'https://api.telegram.org/bot' + telegramToken +
-                '/sendMessage?chat_id=' + telegramChatId +
-                '&text=' + http.Encode(message);
+        '/sendMessage?chat_id=' + telegramChatId +
+        '&text=' + http.Encode(message);
 
     var resp = http.Get(url, {});
     if( resp.Error ) {
@@ -13,34 +13,22 @@ function sendMessage(message) {
     }
 }
 
-log("session script loaded");
-
-// enable recon and probing of new hosts
-run('net.recon on');
-run('net.probe on');
-
-// enable wifi scanning
-run('set wifi.interface ' + wifiInterface);
-run('wifi.recon on');
-
-// register for wifi.deauthentication events
-onEvent('wifi.deauthentication', function(event){
+function onDeauthentication(event) {
     var data = event.Data;
     var message = '🚨 Detected deauthentication frame:\n\n' +
-                  'Time: ' + event.Time.String() + "\n" +
-                  'GPS: lat=' + session.GPS.Latitude + " lon=" + session.GPS.Longitude + " updated_at=" + session.GPS.Updated.String() + "\n\n" +
-                  'RSSI: ' + data.RSSI + "\n" +
-                  'Reason: ' + data.Reason + "\n" +
-                  'Address1: ' + data.Address1 + "\n" +
-                  'Address2: ' + data.Address2 + "\n" +
-                  'Address3: ' + data.Address3;
+        'Time: ' + event.Time.String() + "\n" +
+        'GPS: lat=' + session.GPS.Latitude + " lon=" + session.GPS.Longitude + " updated_at=" + session.GPS.Updated.String() + "\n\n" +
+        'RSSI: ' + data.RSSI + "\n" +
+        'Reason: ' + data.Reason + "\n" +
+        'Address1: ' + data.Address1 + "\n" +
+        'Address2: ' + data.Address2 + "\n" +
+        'Address3: ' + data.Address3;
 
     // send to telegram bot
     sendMessage(message);
-});
+}
 
-// register for wifi.client.handshake events
-onEvent('wifi.client.handshake', function(event){
+function onHandshake(event){
     var data = event.Data;
     var what = 'handshake';
 
@@ -60,12 +48,26 @@ onEvent('wifi.client.handshake', function(event){
 
     // send to telegram bot
     sendMessage(message);
-});
+}
 
-// register for any event
-onEvent(function(event){
+function onAnyEvent(event){
     // if endpoint.new or endpoint.lost, clear the screen and show hosts
     if( event.Tag.indexOf('endpoint.') === 0 ) {
-        run('clear; net.show');
+        // run('clear; net.show');
     }
-});
+}
+
+log("session script loaded");
+
+// enable recon and probing of new hosts
+run('net.recon on');
+run('net.probe on');
+// enable wifi scanning
+run('set wifi.interface ' + wifiInterface);
+run('wifi.recon on');
+// register for wifi.deauthentication events
+onEvent('wifi.deauthentication', onDeauthentication);
+// register for wifi.client.handshake events
+onEvent('wifi.client.handshake', onHandshake);
+// register for any event
+onEvent(onAnyEvent);
diff --git a/session/script.go b/session/script.go
index 45c76618..c3db7b43 100644
--- a/session/script.go
+++ b/session/script.go
@@ -1,9 +1,8 @@
 package session
 
 import (
-	"github.com/evilsocket/islazy/plugin"
-
 	_ "github.com/bettercap/bettercap/js"
+	"github.com/evilsocket/islazy/plugin"
 )
 
 type Script struct {
diff --git a/session/script_builtin_runtime.go b/session/script_builtin_runtime.go
index f180e196..40e1d8e1 100644
--- a/session/script_builtin_runtime.go
+++ b/session/script_builtin_runtime.go
@@ -56,9 +56,12 @@ func jsOnEventFunc(call otto.FunctionCall) otto.Value {
 
 		for event := range listener {
 			if expr == "" || event.Tag == expr {
+				// lock vm
+				I.script.Lock()
 				if _, err := cb.Call(otto.NullValue(), event); err != nil {
 					I.Events.Log(log.ERROR, "error dispatching event %s: %v", event.Tag, err)
 				}
+				I.script.Unlock()
 			}
 		}
 	}(filterExpr, cb)