Is there any reason this c recursive function generates this pagefault?

So I want to write recursive syscall in c which gets all descendands from a process (kids, grandkids, ..). System which I'm using is Minix 3.2.1, but I don't think it should be much different from most UNIX systems. However my function throws very ugly error. The code is as follows:

int do_whoMaxDescendants(void)
{
  int maxChildren = 0;
  pid_t found = -1;

  for (int proc_nr = 0; proc_nr < NR_PROCS; ++proc_nr)
  {
    if (mproc[proc_nr].mp_flags & IN_USE)
    {
      int children = kidCount(proc_nr);
      if (children > maxChildren)
      {
        maxChildren = children;
        found = mproc[proc_nr].mp_pid;
      }
    }
  }
  return found;
}

int kidCount(int currParent)
{
  int children = 0;
  for (int nextParent = 0; nextParent < NR_PROCS; ++nextParent)
  {
    if ((mproc[nextParent].mp_flags & IN_USE) && (mproc[nextParent].mp_parent == currParent))
    {
      children++;
      children = kidCount(nextParent) + children;
    }
  }
  return children;
}

And the error looks like this:

[EDIT] For future generations, for example process INIT is its own parent so calling kidCount on INIT triggers infinity loop. You have to add extra statement to if in KidCount e.g. (process_ID != Parent_process_ID)