Fabonacci series problem error handling num is not

Question

function fibonacci(num) {

if(num < 2) {
    return num;
}
else {
    return fibonacci(num-1) + fibonacci(num - 2);
}

}

const nTerms = prompt('Enter thenumber of terms: ');

if(nTerms <=0) {

console.log('Enter a positive integer.');

} else {

for(let i = 0; i < nTerms; i++) {

    console.log(fibonacci(num));
}

}

//Getting num is not defined ?