I don’t understand **why the test of this exercise return an error**:

`sumPrimes(977) should return 73156.`

If I run this code on my browser, with the console, I correctly receive 73156 as the return value:

```
function sumPrimes(num) {
let sum = 0;
while(num > 1) {
sum = sum + isPrime(num);
num--;
}
return sum;
}
function isPrime(n) {
let divisor = n - 1;
let found = false;
while(divisor > 1) {
if(n % divisor == 0) {
found = true;
break;
}
divisor--;
}
if(!found) {
return n;
}
return 0;
}
```

*So, why the test doesn’t pass?*