fix(realtime): undefined projectId for shared stats

app/controllers/api/health.php

@@ -6,7 +6,6 @@ use Utopia\Storage\Device\Local;
 use Utopia\Storage\Storage;
 use Appwrite\ClamAV\Network;
 use Appwrite\Event\Event;
-use RuntimeException;
 
 App::get('/v1/health')
     ->desc('Get HTTP')

app/realtime.php

@@ -324,7 +324,9 @@ $server->on('message', function (Server $server, Frame $frame) {
 });
 
 $server->on('close', function (Server $server, int $connection) use (&$connections, &$subscriptions, &$stats) {
-    $stats->decr($connections[$connection]['projectId'], 'connectionsTotal');
+    if (array_key_exists($connection, $connections)) {
+        $stats->decr($connections[$connection]['projectId'], 'connectionsTotal');
+    }
     Realtime::unsubscribe($connection, $subscriptions, $connections);
     Console::info('Connection close: ' . $connection);
 });