diff --git a/src/WebSockets/Channels/ChannelManager.php b/src/WebSockets/Channels/ChannelManager.php
index 765bc23..b8cd4f4 100644
--- a/src/WebSockets/Channels/ChannelManager.php
+++ b/src/WebSockets/Channels/ChannelManager.php
@@ -47,6 +47,10 @@ class ChannelManager
 
     public function removeFromAllChannels(ConnectionInterface $connection)
     {
+        if (! isset($connection->client)) {
+            return;
+        }
+
         collect($this->channels[$connection->client->appId])->each->unsubscribe($connection);
 
         collect($this->channels[$connection->client->appId])