c - while ... readdir causing segementation fault -

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in main call following function deletefolder():

void deletefolder(){     struct dirent *next_file;    dir *folder;     char filepath[256];     folder = opendir("./game/wow");     while((next_file = readdir(folder)) != null){ //this causing segmentation fault. dont know why??         sprintf(filepath, "%s/%s", "./game/wow", next_file->d_name);       remove(filepath);     } }

i can't figure out why happening? 

while((next_file = readdir(folder)) != null){ //this causing segmentation fault. dont know why??

i suspect there error in opening directory. add error checking code.

folder = opendir("./game/wow"); if ( folder == null ) {    perror("unable open folder.");    return; }  while((next_file = readdir(folder)) != null){ ...

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