Notify::getChatData

private function getChatData(): ?array
{
	$userId = BitrixImCommon::getUserId();
	if (!$userId)
	{
		return null;
	}

	$chatData = BitrixImModelRelationTable::getList([
		'select' => ['CHAT_ID', 'CHAT.MESSAGE_COUNT'],
		'filter' => [
			'=USER_ID' => $userId,
			'=MESSAGE_TYPE' => 'S'
		]
	])->fetch();
	if (!$chatData)
	{
		return null;
	}

	return $chatData;
}