Using ofNode to build an L-System

Nope, it is still not working, I've a bad memory access. I've simplified and pushed the code, removing the part with the L-System grammar that is not the problem.

void ofApp::setup(){
    mesh.setMode(OF_PRIMITIVE_POINTS);
    mesh.enableColors();

    auto joinBranch = ofNode();
    auto oldBranch = ofNode();
    auto newBranch = ofNode();

    oldBranch.setPosition(150, 700, 0);
    oldBranch.move(ofVec3f(0, -100, 0));
    mesh.addVertex(oldBranch.getGlobalPosition());
    mesh.addColor(ofFloatColor(1.0, 0.0, 0.0));

    for(int i = 0; i < 4; i++){
        joinBranch = ofNode();
        joinBranch.setParent(oldBranch);
        joinBranch.roll(25.0);

        newBranch = ofNode();
        newBranch.setParent(joinBranch);
        newBranch.move(0, -100.0, 0);

        mesh.addVertex(newBranch.getGlobalPosition());
        mesh.addColor(ofFloatColor(1.0, 0.0, 0.0));

        //reassign oldBranch value
        oldBranch = newBranch;
    }
}

void ofApp::draw(){
    ofBackground(0);
    mesh.draw();
}

I do not need to keep the jointBranch in a vector, because what i need are just the points in the mesh.