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ah, easy "out of bounds" error:

your contours vector is initially empty, so contours.size() is 0, and you allocate 0 elements in your vector<Point2f>center( contours.size() ); , so center[i] is invalid (same for radius).

move the allocation to a stage, where you know how many contours you have , like:

if (contours.size() > 0){
    vector<Point2f>center( contours.size() );
    vector<float>radius_cur( contours.size() );
    ...