C++ Multidimensional Vectors Appending

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Let's say I have a 2D vector:

std::vector<std::vector<int>> world;

I want to achieve something like this:

world[0][0] = x;
world[0][1] = y;
etc

So I came up with this function:

int Controller::AddBody(SDL_Rect RECT, SDL_Color COLOR)
{
    world[world.size() + 1].push_back(RECT.x);
    world[world.size() + 1].push_back(RECT.y);
    world[world.size() + 1].push_back(RECT.w);
    world[world.size() + 1].push_back(RECT.h);
    world[world.size() + 1].push_back(COLOR.r);
    world[world.size() + 1].push_back(COLOR.g);
    world[world.size() + 1].push_back(COLOR.b);
    world[world.size() + 1].push_back(COLOR.a);

    return world.size() + 1;
}

however this creates an exception. I can't understand why?

asked 46 secs ago

user3806521

1