Fix #63

Author: massadm

src/BotManager.php

@@ -502,7 +502,8 @@ protected function defaultGetUpdatesCallback($get_updates_response): string
                 $text    .= ";{$update_content->getQuery()}";
             } elseif ($update_content instanceof CallbackQuery) {
                 /** @var CallbackQuery $update_content */
-                $chat_id = $update_content->getMessage()->getChat()->getId();
+                $message = $update_content->getMessage();
+                $chat_id = ($message && $message->getChat()) ? $message->getChat()->getId() : null;
                 $text    .= ";{$update_content->getData()}";
             }