Task::stopTimer

private function stopTimer(\CTaskItem $task): ?bool
{
	$timer = \CTaskTimerManager::getInstance($this->getCurrentUser()->getId());
	if ($timer->stop($task->getId()) === false)
	{
		$this->addError(new Error(GetMessage('TASKS_FAILED_STOP_TASK_TIMER')));
		return null;
	}
	return true;
}