Input validation in c++.

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C++

Below is my code and the program works fine until I enter anything other than a number. The problem occurs during the input validation of score.

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int counter = 0;
    double score,
           averagescore,
           totalscore = 0.0;

    cout << "Enter the score of a student, or -1 if no more students are left.\n";
    cin >> score;
    while (score < -1 || score > 100)
    {
        cout << "\nThat is not a valid answer please enter a percent between -1 and 100\n";
        cin >> score;
    }

    while (score != -1)
    {
        totalscore += score;
        cout << "\nEnter the score of a student, or -1 if no more students are left.\n";
        cin >> score;
        while (score < -1 || score > 100)
        {
            cout << "\nThat is not a valid answer please enter a percent between -1 and 100\n";
            cin >> score;
        }
        counter++;
    }

    averagescore = totalscore / counter;
    cout << "\nThe average score of the class is: " << averagescore << '%' << endl;
}

What I have tried:

I tried looking through to see if there were any logic errors and none came to me even though I looked through several times. I'm assuming this is a logic error, but I am not sure what I should do to make it so this input validation only accepts numbers between -1 and 100.