diff --git a/draw/consumers.py b/draw/consumers.py
index a3f091a..8ac2172 100644
--- a/draw/consumers.py
+++ b/draw/consumers.py
@@ -47,6 +47,10 @@ class DrawConsumer(AsyncJsonWebsocketConsumer):
 
         # Fetch the registration of the current user
         user = self.scope['user']
+        if user.is_anonymous:
+            # User is not authenticated
+            await self.close()
+            return
         reg = await Registration.objects.aget(user_id=user.id)
         self.registration = reg
 
diff --git a/draw/static/draw.js b/draw/static/draw.js
index f45468c..b646202 100644
--- a/draw/static/draw.js
+++ b/draw/static/draw.js
@@ -736,7 +736,7 @@ document.addEventListener('DOMContentLoaded', () => {
         }
     }
 
-    function setupSocket() {
+    function setupSocket(nextDelay = 1000) {
         // Open a global websocket
         socket = new WebSocket(
             (document.location.protocol === 'https:' ? 'wss' : 'ws') + '://' + window.location.host + '/ws/draw/'
@@ -753,7 +753,7 @@ document.addEventListener('DOMContentLoaded', () => {
         // Manage errors
         socket.addEventListener('close', e => {
             console.error('Chat socket closed unexpectedly, restarting…')
-            setupSocket()
+            setTimeout(() => setupSocket(2 * nextDelay), nextDelay)
         })
 
         // When the socket is opened, set the language in order to receive alerts in the good language