Connection undefined when leaving failed room bug fixed

README.md

@@ -275,13 +275,13 @@ Whatever app you are developing, chances are you will need to pass some data for
 
 - **API REST**: when asking for a token to */newToken*, you can pass data as third parameter in the BODY of the POST request 
 	```
-	{“0”: “sessionId”, “1”: “role”, “2”: "DATA"}
+	{“session”: “sessionId”, “role”: “role”, “data”: "DATA"}
 	```
 
 	> **openvidu-backend-client** allows you to pass data when creating a Token object: </br>
 	> `Token t = new TokenOptions.Builder().data("DATA").build();`
 
-The result will be that in all clients *Connection* objects will have in their *data* property the pertinent value you have provided for each user. So, an easy way to get the data associated to any user would be:
+The result will be that in all clients, *Connection* objects will have in their *data* property the pertinent value you have provided for each user. So, an easy way to get the data associated to any user would be:
 
 ```javascript
 session.on('streamCreated', function (event) {

openvidu-browser/src/main/resources/ts/OpenVidu/Session.ts

@@ -30,9 +30,11 @@ export class Session {
             for (s of this.openVidu.openVidu.getRemoteStreams()) {
                 s.removeVideo();
             }
+            if (this.connection) {
                 for (let streamId in this.connection.getStreams()) {
                     this.connection.getStreams()[streamId].removeVideo();
                 }
+            }
         });
 
         // Sets or updates the value of 'connection' property. Triggered by SessionInternal when succesful connection

openvidu-browser/src/main/resources/ts/OpenViduInternal/OpenViduInternal.ts

@@ -40,7 +40,8 @@ export class OpenViduInternal {
 
     checkNgrokUri() {
         if (this.wsUri.indexOf(".ngrok.io") !== -1) {
-            // OpenVidu server URL referes to a ngrok IP: delete port of URL
+            // OpenVidu server URL referes to a ngrok IP: secure wss protocol and delete port of URL
+            this.wsUri = this.wsUri.replace("ws://", "wss://");
             let regex = /\.ngrok\.io:\d+/;
             this.wsUri = this.wsUri.replace(regex, ".ngrok.io");
         } else if (this.wsUri.indexOf("localhost") !== -1) {