Exception::getFirstErrorMessage

public function getFirstErrorMessage(): string
{
	$message = $this->getMessage();
	$message = @unserialize($message, ['allowed_classes' => false]);

	if ($message === false)
	{
		return $this->getMessage();
	}

	if (
		is_array($message)
		&& isset($message[0]['text'])
	)
	{
		return $message[0]['text'];
	}

	return $this->getDefaultMessage();
}