diff --git a/src/Protocols/Pusher/PusherPubSubIncomingMessageHandler.php b/src/Protocols/Pusher/PusherPubSubIncomingMessageHandler.php
index 32c16d6..5cc5725 100644
--- a/src/Protocols/Pusher/PusherPubSubIncomingMessageHandler.php
+++ b/src/Protocols/Pusher/PusherPubSubIncomingMessageHandler.php
@@ -15,7 +15,9 @@ public function handle(string $payload): void
         $event = json_decode($payload, associative: true, flags: JSON_THROW_ON_ERROR);
 
         $application = unserialize($event['application']);
-        $except = app(ChannelManager::class)->for($application)->connections()[$event['socket_id']] ?? null;
+        $except = isset($event['socket_id']) ?
+            app(ChannelManager::class)->for($application)->connections()[$event['socket_id']] ?? null
+            : null;
 
         match ($event['type'] ?? null) {
             'message' => EventDispatcher::dispatchSynchronously(