We had a DataStructure error in the control room running today. Looks like tofcalib reducer was failing with log file as attached. I believe the error is in file src/input/InputCppDAQData/UnpackEventLib.cc function int V1724DataProcessor::Process(MDdataContainer* aPartEventPtr)

int V1724DataProcessor::Process(MDdataContainer* aPartEventPtr) {
  // Cast the argument to structure it points to.
  // This process should be called only with MDfragmentV1724 argument.
  if ( typeid(*aPartEventPtr) != typeid(MDpartEventV1724) )  return CastError;
  MDpartEventV1724* xV1724Evnt = static_cast<MDpartEventV1724*>(aPartEventPtr);

  Json::Value pBoardDoc;
  Json::Value xfAdcHit;
  int xLdc, xGeo, xEquip, xPartEv;
  string xDetector = "unknown";
  if ( !xV1724Evnt->IsValid() )
    return GenericError;

  // Put static data into the Json
  pBoardDoc["ldc_id"]       = xLdc = this->GetLdcId();
  pBoardDoc["equip_type"] = xEquip = this->GetEquipmentType();
  pBoardDoc["time_stamp"]          = this->GetTimeStamp();
  pBoardDoc["phys_event_number"]   = this->GetPhysEventNumber();
  pBoardDoc["part_event_number"] = xPartEv = this->GetPartEventNumber();
  pBoardDoc["geo"]          = xGeo = xV1724Evnt->GetGeo();
  pBoardDoc["trigger_time_tag"]    = xV1724Evnt->GetTriggerTimeTag();
  // Loop over all the channels    
  for (unsigned int xCh = 0; xCh < V1724_NCHANNELS; xCh++) {
    unsigned int xSamples = ( xV1724Evnt->GetLength(xCh) )*V1724_SAMPLES_PER_WORD;
    for (unsigned int j = 0; j < xSamples; j++) {
      int sample = xV1724Evnt->GetSampleData(xCh,  // Channel ID
                                             j);  // Sample ID
      _data.push_back(sample);
    }
    xfAdcHit = pBoardDoc;
    this->set_pedestal();
    int charge_mm = this->get_charge(ceaMinMax);
    if ( !_zero_suppression ||
         (_zero_suppression && charge_mm > _zs_threshold) ) {
      xfAdcHit["charge_mm"]    = charge_mm;
      xfAdcHit["charge_pm"]    = this->get_charge(ceaPedMax);
      xfAdcHit["position_max"] = this->get_max_position();
      xfAdcHit["pedestal"]     = this->get_pedestal();
      DAQChannelKey* xKey = _chMap->find(xLdc, xGeo, xCh, xEquip);
      if (xKey) {
        xDetector = xKey->detector();
        xfAdcHit["channel_key"]   = xKey->str();
        xfAdcHit["detector"]      = xDetector;
      } else {
        xfAdcHit["detector"] = xDetector = "unknown";
      }
      xfAdcHit["channel"]        = xCh;

      ( *_docSpill )[xDetector][ xPartEv ][_equipment].append(xfAdcHit);
    }
    _data.resize(0);
  }

  return OK;
}

When the "detector" is "unknown", "channel_key" is not set and I believe this is causing the problem. I notice this is also a problem in some of the other DataProcessors. Propose to fix that we make an empty branch "channel_key" = "" when detector is unknown.