program breaks if questions with OR answers are incorrect ?

var name = prompt('What is your name ?');
alert('Welcome to the quiz, ' + name + '. You will now be asked 5 questions.');

var correct = 0;

//question 1
var answer = prompt('1/) What is the capital of Minnesota?');
if ( answer.toUpperCase() === 'SAINT PAUL' || answer.toUpperCase() === 'ST. PAUL' ) {
    correct += 1;
    alert('Correct ! You are ' + correct + ' for 1! ');
} else {
    alert('Incorrect..., You are ' + correct + ' for 1!');
}

//question 2
answer = prompt('2/) What is the largest city in Minnesota?');
if ( answer.toUpperCase() === 'MINNEAPOLIS') {
    correct += 1;
    alert('Correct ! You are ' + correct + ' for 2! ');
} else {
    alert('Incorrect..., You are ' + correct + ' for 2!' );
}

//question 3
answer = prompt('3/) Duluth is located on the shores of which lake ?');
if ( answer.toUpperCase() === 'SUPERIOR' || answer.toUpperCase() === 'LAKE SUPERIOR' ) {
    correct += 1;
    alert('Correct ! You are ' + correct + ' for 3! ');
} else {
    alert('Incorrect..., You are ' + correct + ' for 3!');
}

//question 4
answer = prompt('4/) What is the most populated county in Minnesota?');
if ( answer.toUpperCase() === 'HENNEPIN') {
    correct += 1;
    alert('Correct ! You are ' + correct + ' for 4! ');
} else {
    alert('Incorrect..., You are ' + correct + ' for 4!' );
}

//question 5
answer = prompt('5/) What lake is the source of the Mississippi River');
if ( answer.toUpperCase() === 'ITASCA' || answer.toUpperCase() === 'LAKE ITASCA' ) {
    correct += 1;
    alert('Correct ! You are ' + correct + ' for 5! ');
} else {
    alert('Incorrect..., You are ' + correct + ' for 5!');
}

if ( correct === 5 ) {
    alert(name + ', You answered ' + correct + ' of 5 questions correctly and earned the GOLD CROWN ! Congratulations');
} else if ( correct >= 3) {
    alert(name + ', You answered ' + correct + ' of 5 questions correctly and earned the SILVER CROWN ! Good Job');
} else if ( correct >= 1) {
    alert(name + ', You answered ' + correct + ' of 5 questions correctly and earned the BRONZE CROWN ! Keep Trying !');
} else {
    alert(name + ', You answered ' + correct + ' of 5 questions correctly and earned the no crown...because you suck...greeeeat work...');
}