Getting a logic error in my programming

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#include <iostream>

void clearScreen(int lines)
{
	for (int i = 0; i < lines; i++)
	{
		std::cout << std::endl;
	}
}


struct shipSetup{
	int xcoord;
	int ycoord;
	std::string shipName;
};

shipSetup ship;


void shipPosition(shipSetup ship)
{
    std::cout << ship.shipName << "'s Galactic Positioning" << std::endl << std::endl;
    std::cout << "X Position: " << ship.xcoord << std::endl;
    std::cout << "Y Position: " << ship.ycoord << std::endl << std::endl;
}

int main()
{
    int userInputDirection;
    std::string inputBuffer;
    int userInputYear = 0;
	bool cont = 1;
	bool validYearInput = 1;
	ship.xcoord = 0;
	ship.ycoord = 0;

	clearScreen(100);
	std::cout << "What would you like your ship to be called? ";
	std::getline(std::cin, ship.shipName);

	while (cont)
	{
	    clearScreen(100);
        shipPosition(ship);
        std::cout << "1 = Up" << std::endl << "2 = Down" << std::endl << "3 = Left" << std::endl << "4 = Right" << std::endl;
        std::cout << "What direction would you like to move? ";
        std::cin >> userInputDirection;
        std::cout << "How many lightyears would you like to move in the direction for? ";
        std::cin >> userInputYear;
        if (userInputYear <= 0)
        {
            std::cout << "Please enter a number larger then 0, Press \"enter\" to continue";
            std::getline(std::cin, inputBuffer);
            validYearInput = 0;
        }

       while(validYearInput)
       {
            if (userInputDirection == 1)
            {
                ship.xcoord = ship.xcoord + userInputYear;
            }
            else if (userInputDirection == 2)
            {
                ship.xcoord = ship.xcoord - userInputYear;
            }
            else if (userInputDirection == 3)
            {
                ship.ycoord = ship.ycoord - userInputYear;
            }
            else if (userInputDirection == 4)
            {
                ship.ycoord = ship.ycoord + userInputYear;
            }
            else
            {
                std::cout << "Please enter in a number 1-4, note the guide, Press \"enter\" to continue";
                std::getline(std::cin, inputBuffer);
            }

        }
        validYearInput = 1;

	}
}


After the user enters in the number for the lightyears, the program stops. No input and no Output. I have no idea why this is happening.
The program never gets out of the while loop on line 58. while(validYearInput)
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