Segfault in iterating std::set with auto, insert and erase

Hi i am a beginner programmer in c++. I have a segmentation fault when i tried to run this program.

This below is where i think the problem lies, but i don't get why i get a segmentation fault. I tried running in repl.it it works perfectly but when i run in on my local MacOs compiled with g++ or clang++, i get a segmentation fault. Can anyone tell me why this happens and how can I debug it?

Suspect:

for (auto x: subset)
{
    subset.erase(x);
    canSum = canSum | sum(subset, n - x);
    subset.insert(x);
}

Full code:

bool sum(std::set<int>& subset, int n)
{
    if (n == 0)
    {
        return true;
    }

    else if (n < 0 || subset.empty())
    {
        return false;
    }

    bool canSum = 0;

    if (!subset.empty())
    {
        for (auto x: subset)
        {
            subset.erase(x);
            canSum = canSum | sum(subset, n - x);
            subset.insert(x);
        }
    }
    return canSum;
}