message: Bugfix seg-fault in HPS.
diff: @@ -505,7 +505,7 @@ size_t HashMapBackend<TKey>::fetch(const std::string& table_name, const size_t n
  const time_t now = std::time(nullptr);
  size_t batch_size = 0;
  - for (; keys_end; k++) {
  + for (; k != keys_end; k++) {
  if (HCTR_KEY_TO_PART_INDEX(*k) == part.index) {
  HCTR_HASH_MAP_BACKEND_FETCH_(*k, k - keys);
  if (++batch_size >= this->max_get_batch_size_) {
  