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I want to apply a smooth to an image,for that purpose I create the function "sum" Here's my code

double sum(cv::Mat img, int startedX, int startedY, int w) {
double res = 0;
std::cout << "startedX= " << startedX<< "/ startedY= " << startedY<<  std::endl; 
for (int i = startedX - ((w - 1) / 2); i < startedX + ((w + 1) / 2); i++) {
  std::cout << "i= " << i <<  std::endl;    
    for (int j = startedY - ((w - 1) / 2) ; j < startedY + ((w + 1) / 2); j++) {std::cout << " j= " <<j<<  std::endl;
     if ((i >= 0 && i < img.size().width) && (j >= 0  && j < img.size().height)) {      
            res += img.at<float>(i,j); }}}
              return res;}

This is a portion of my main function where the program crashes :

for (int k = 0; k < imgSource.size().width; k++) {
 for (int l = 0; l < imgSource.size().height; l++) {
        if( (k >= 0 && k < imgSource.size().width) && (l >= 0  && l < imgSource.size().height) ) {
      std::cout << "k= "<<k <<"  l= "<<l<< " wmax= "<< wmax<<std::endl; 
      newImgMax.at<float>(k,l) =(float)sum(imgMax,k,l, wmax) / (wmax * wmax);
       }}}

for k=0 and l=0 the program works fine and returns a value but for k=0 and l=1 the call of the function(sum(imgMax,0,1,1)) doesn't pass,it crashes and shows a segmentation fault core dumped.This is my output

k= 0  l= 0 wmax= 1
startedX= 0/ startedY= 0
i= 0
j= 0
k= 0  l= 1 wmax= 1
Segmentation fault (core dumped)