Avoid issues with non-connected DCs

docs

@@ -1 +1 @@
-Subproject commit dfec70a8c5a6a6eca9e9d47e582141bc8a86aba8
+Subproject commit 4ed3a8447cf21c69322bcdaf149eb3ce0befe8c0

src/danog/MadelineProto/DataCenterConnection.php

@@ -360,6 +360,16 @@ class DataCenterConnection implements JsonSerializable
         return $this->ctx;
     }
 
+    /**
+     * Has connection context?
+     *
+     * @return bool
+     */
+    public function hasCtx(): bool
+    {
+        return isset($this->ctx);
+    }
+
     /**
      * Connect function.
      *

src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php

@@ -663,6 +663,7 @@ trait AuthKeyHandler
             $dcs = [];
             $postpone = [];
             foreach ($this->datacenter->getDataCenterConnections() as $id => $socket) {
+                if (!$socket->hasCtx()) continue;
                 if ($socket->isMedia()) {
                     $oid = \intval($id);
                     if (isset($dcs[$oid])) {