Use of a moved from object

I want to call a function that constructs a stringstream object and if some condition is met, invalidate the stringstream. When I try this, I get a warning from using a moved from object. How can I prevent this without switching to a string?

#include <iostream>
#include <sstream>
#include <functional>

using namespace std;

bool Condition(string) { return true; }

stringstream someFunc(function<bool(string&)> Condition) {
    stringstream ssRes; // Warning C26800 Use of a moved from object:'ssRes'

    ssRes << "here is a string";

    string str = ssRes.str();
    if (!Condition(str)) { ssRes.setstate(ios_base::failbit); }
    return ssRes;
}

int main() {
    stringstream ss = someFunc(Condition);
    return 0;
}