seg fault is somewhere

gistfile1.cpp

void remove(node** parent, int offset) {
  node* cursor = *parent;
  if (cursor->next==NULL || offset > size(*parent)) {
    return;
  } else if (offset==0) {
    cursor=cursor->next;
  } else {
    for (int i=1;i<offset;i++) {
      cursor=cursor->next;
    }
    cursor->next=cursor->next->next;
  }
}

It gives the same message even when I comment out everything in the remove function (except the brackets so that the driver will run).