diff --git a/front/src/routes/scene/SceneCard.jsx b/front/src/routes/scene/SceneCard.jsx
index 8bd4830dee..5ac5e07e41 100644
--- a/front/src/routes/scene/SceneCard.jsx
+++ b/front/src/routes/scene/SceneCard.jsx
@@ -1,34 +1,49 @@
 import { Text } from 'preact-i18n';
 import { Component } from 'preact';
 import { Link } from 'preact-router/match';
+import cx from 'classnames';
 import style from './style.css';
 
 class SceneCard extends Component {
-  startScene = () => {
-    this.props.startScene(this.props.scene.selector);
+  startScene = async () => {
+    try {
+      await this.setState({ saving: true });
+      await this.props.httpClient.post(`/api/v1/scene/${this.props.scene.selector}/start`);
+    } catch (e) {}
+    // make sure the loader is displayed at least 200ms
+    setTimeout(() => this.setState({ saving: false }), 200);
   };
 
-  render(props, {}) {
+  render(props, { saving }) {
     return (
       <div class="col-sm-6 col-lg-3">
         <div class="card h-100">
-          <div class="card-body p-3 text-center">
-            <div class={style.scene_icon}>
-              <i class={`fe fe-${props.scene.icon}`} />
-            </div>
-            <h4>{props.scene.name}</h4>
-            <div class="text-muted">{props.scene.description}</div>
-          </div>
-          <div class="card-footer">
-            <div class="btn-list text-center">
-              <Link href={`${props.currentUrl}/${props.scene.selector}`} class="btn btn-outline-primary btn-sm">
-                <i class="fe fe-edit" />
-                <Text id="scene.editButton" />
-              </Link>
-              <button onClick={this.startScene} type="button" class="btn btn-outline-success btn-sm">
-                <i class="fe fe-play" />
-                <Text id="scene.startButton" />
-              </button>
+          <div
+            class={cx('dimmer', {
+              active: saving
+            })}
+          >
+            <div class="loader" />
+            <div class="dimmer-content">
+              <div class="card-body p-3 text-center">
+                <div class={style.scene_icon}>
+                  <i class={`fe fe-${props.scene.icon}`} />
+                </div>
+                <h4>{props.scene.name}</h4>
+                <div class="text-muted">{props.scene.description}</div>
+              </div>
+              <div class="card-footer">
+                <div class="btn-list text-center">
+                  <Link href={`${props.currentUrl}/${props.scene.selector}`} class="btn btn-outline-primary btn-sm">
+                    <i class="fe fe-edit" />
+                    <Text id="scene.editButton" />
+                  </Link>
+                  <button onClick={this.startScene} type="button" class="btn btn-outline-success btn-sm">
+                    <i class="fe fe-play" />
+                    <Text id="scene.startButton" />
+                  </button>
+                </div>
+              </div>
             </div>
           </div>
         </div>
diff --git a/server/api/websockets/index.js b/server/api/websockets/index.js
index 0e85cf8b26..19b0e7108e 100644
--- a/server/api/websockets/index.js
+++ b/server/api/websockets/index.js
@@ -1,3 +1,4 @@
+const WebSocket = require('ws');
 const { parseWebsocketMessage, formatWebsocketMessage } = require('../../utils/websocketUtils');
 const { EVENTS, WEBSOCKET_MESSAGE_TYPES, ERROR_MESSAGES } = require('../../utils/constants');
 const logger = require('../../utils/logger');
@@ -21,7 +22,9 @@ function sendMessageUser({ type, payload, userId }) {
     return;
   }
   this.connections[userId].forEach((userConnection) => {
-    userConnection.client.send(formatWebsocketMessage(type, payload));
+    if (userConnection && userConnection.client && userConnection.client.readyState === WebSocket.OPEN) {
+      userConnection.client.send(formatWebsocketMessage(type, payload));
+    }
   });
 }
 
@@ -35,7 +38,9 @@ function sendMessageAllUsers({ type, payload }) {
   const usersIds = Object.keys(this.connections);
   usersIds.forEach((userId) => {
     this.connections[userId].forEach((userConnection) => {
-      userConnection.client.send(formatWebsocketMessage(type, payload));
+      if (userConnection && userConnection.client && userConnection.client.readyState === WebSocket.OPEN) {
+        userConnection.client.send(formatWebsocketMessage(type, payload));
+      }
     });
   });
 }
diff --git a/server/test/websockets/index.test.js b/server/test/websockets/index.test.js
new file mode 100644
index 0000000000..7afd2d5954
--- /dev/null
+++ b/server/test/websockets/index.test.js
@@ -0,0 +1,61 @@
+const EventEmitter = require('events');
+const WebSocket = require('ws');
+const { assert, fake } = require('sinon');
+const WebsocketManager = require('../../api/websockets');
+
+describe('Websockets', () => {
+  it('should send message to all users', () => {
+    const wss = new EventEmitter();
+    const gladys = {
+      event: new EventEmitter(),
+    };
+    const websocketManager = new WebsocketManager(wss, gladys);
+    const client = {
+      readyState: WebSocket.OPEN,
+      send: fake.returns(0),
+    };
+    const message = {
+      type: 'test',
+      payload: 'test',
+    };
+    websocketManager.userConnected({ id: 'aa0eaee9-5b90-4287-841a-0237f9d75832' }, client);
+    websocketManager.sendMessageAllUsers(message);
+    assert.calledWith(client.send, JSON.stringify(message));
+  });
+  it('should not send message to all users', () => {
+    const wss = new EventEmitter();
+    const gladys = {
+      event: new EventEmitter(),
+    };
+    const websocketManager = new WebsocketManager(wss, gladys);
+    const client = {
+      readyState: WebSocket.CLOSED,
+      send: fake.returns(0),
+    };
+    const message = {
+      type: 'test',
+      payload: 'test',
+    };
+    websocketManager.userConnected({ id: 'aa0eaee9-5b90-4287-841a-0237f9d75832' }, client);
+    websocketManager.sendMessageAllUsers(message);
+    assert.notCalled(client.send);
+  });
+  it('should send message to one users', () => {
+    const wss = new EventEmitter();
+    const gladys = {
+      event: new EventEmitter(),
+    };
+    const websocketManager = new WebsocketManager(wss, gladys);
+    const client = {
+      readyState: WebSocket.OPEN,
+      send: fake.returns(0),
+    };
+    const message = {
+      type: 'test',
+      payload: 'test',
+    };
+    websocketManager.userConnected({ id: 'aa0eaee9-5b90-4287-841a-0237f9d75832' }, client);
+    websocketManager.sendMessageUser({ ...message, userId: 'aa0eaee9-5b90-4287-841a-0237f9d75832' });
+    assert.calledWith(client.send, JSON.stringify(message));
+  });
+});