从函数崩溃返回，仅在代码中的某个点之后

I am having trouble figuring out why my function is crashing my program when I return from it. I did a bit of debugging and fond the moment where returning from the function causes it to crash.

void Find_contour()
{
//VAR
double threshold_val = 128;
int n_erode_dilate = 1;
Mat m = img_complete.clone();

cvtColor(m, m, CV_RGB2GRAY);
blur(m, m, Size(5, 5));
threshold(m, m, threshold_val, 255, CV_THRESH_BINARY);
erode(m, m, Mat(), Point(-1, -1), n_erode_dilate);
dilate(m, m, Mat(), Point(-1, -1), n_erode_dilate);

vector<vector<Point> > contours;
vector<Point> points;

    //returning here is safe******

findContours(m, contours, CV_RETR_LIST, CV_CHAIN_APPROX_NONE);

    //returning after here crashes******

for (size_t i = 0; i<contours.size(); i++) {
    for (size_t j = 0; j < contours[i].size(); j++) {
        Point p = contours[i][j];
        points.push_back(p);
    }
}


vector<vector<Point>> contours_poly(contours.size());
vector<Rect> boundRect(contours.size());
vector<Point2f> center(contours.size());

for (int i = 0; i < contours.size(); i++)
{
    approxPolyDP(Mat(contours[i]), contours_poly[i], 3, true);
    boundRect[i] = boundingRect(Mat(contours_poly[i]));
}

//drawContours(img_contour, contour, idx, colors[idx % 4]);

for (int i = 0; i< contours.size(); i++)
{
    Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
    drawContours(drawing, contours, i, color, 2, 8, CV_RETR_LIST, 0, Point());
    rectangle(drawing, boundRect[i].tl(), boundRect[i].br(), color, 2, 8, 0);
}

}

这是函数，我已经标记了可以安全返回的位置和崩溃的位置，所以我假设它与我在那里的向量有关.