Невозможно прочитать свойство 'vehicle_full' из неопределенного

Question

Когда я загружаю свое приложение, я получаю это исключение js.Не уверен, почему!

Uncaught (в обещании) TypeError: Невозможно прочитать свойство 'vehicle_full' из неопределенного в ActionCreators.js:?

export function loadPairDataActionCreator(address, refresh, topPartner, bottomPartner) {
  return dispatch => fetch(address, returnHeaders())
    .then(res => checkLogout(res))
    .then(
      data => {
        // Change primary key from SHA to cName
        if (data) {
          let nd = [];
          for (let p in data) {
            const pair = data[p];
            let tmp = {};
            const pair_ids = Object.keys(pair);
            for (let pi of pair_ids) {
              tmp[pair[pi].vehicle_full] = pair[pi];
            }
            nd.push(tmp);
          }
          data = nd;
          store.dispatch(currentPairs(data));
          let vehicles = store.getState().vehicles,
            keys = Object.keys(vehicles);

          for (var i = 0; i < data.length; i++) {
            const pair = data[i];

            // pair ids
            const [vehicle1, vehicle2] = Object.keys(pair);

            // Add pairedWith field to each truck in the pair

            store.dispatch(
              addPairedVehicleActionCreator(
                pair[vehicle2].vehicle_full, //<--- error here
                vehicle1
              ))
            store.dispatch(
              addPairedVehicleActionCreator(
                pair[vehicle1].vehicle_full,
                vehicle2
              ))
          }
          store.dispatch(pairingComplete(true))
        }
      },
      err => dispatch({
        type: 'LOAD_PAIR_DATA_FAILURE',
        err
      })
    )
    .then(
      () => {
        if (refresh === "unpair") {
          store.dispatch(changePageModeActionCreator({
            mode: "READY_TO_UNPAIR",
            rowIdentifier: store.getState().pageMode.rowIdentifier
          }));
        } else if (refresh === "pair") {
          store.dispatch(changePageModeActionCreator({
            mode: "READY_TO_PAIR",
            rowIdentifier: topPartner,
            rowIdentifierBottom: bottomPartner
          }));

        }
      }
    )
    .then(
      () => {
        store.dispatch(removePairedVehicleActionCreator(topPartner)),
          store.dispatch(removePairedVehicleActionCreator(bottomPartner))
      }
    )
}