I have got panic: runtime error: invalid memory address or nil pointer dereference in Golang

panic: runtime error: invalid memory address or nil pointer dereference

when i add

statusCOD, err := c.route.FindStatusCODByOrigin(ctx, req.Origin)
			if err != nil {
				if err != sql.ErrNoRows {
					ddlogger.Log(ctx, span, "Find status cod destination and cod origin", err)
					errChan <- err
					return
				}
			}

			if statusCOD != nil {
				IsCODOrigin = statusCOD.IsCODOrigin
				IsCODDestination = statusCOD.IsCODDestination
			}

in this func

for i, v := range detailShipments {
		var dtPackage repo.PackageBaseModel

		go func(idx int, vShipment repo.ShipmentDetailBaseModel, dataShipmentNew repo.ShipmentCODCreateModel) {
			defer wg1.Done()

			randomID := commonString.RandomWithCustomCharList(c.config.ShipmentCODIDRandom, c.config.ShipmentIDCharlist)
			shipmentID := fmt.Sprintf("%s%s", prefix, randomID)
			dataShipmentNew.ShipmentBaseModel.ShipmentID = strings.ToUpper(shipmentID)
			dataShipmentNew.ShipmentDetailBaseModel = vShipment
			var commodityName string

			sCategory, err := c.shipmentCategoryRepo.FindOneShipmentCategoryByID(ctx, vShipment.ShipmentCategoryID.Int64)

			if err != err && err != sql.ErrNoRows {
				ddlogger.Log(ctx, span, "shipmentService-CreateShipmentCOD "+shipmentID, " Failed shipmentCategoryRepo.FindOneShipmentCategoryByID", err)
			} else {
				if sCategory != nil {
					commodityName = sCategory.CommodityName.String
				}
			}

			req := &repo.TariffRequestModelV2{
				Origin:      form.DetailSender.Origin,
				Destination: vShipment.Destination,
				Weight:      vShipment.GrossWeight / 1000,
				Commodity:   commodityName,
				GoodsValue:  int64(vShipment.GoodValues.Float64),
				IsInsurance: vShipment.IsInsurance.Bool,
				Product:     vShipment.ProductType,
				Width:       vShipment.DimensionWidth.Float64,
				Height:      vShipment.DimensionHeight.Float64,
				Length:      vShipment.DimensionLength.Float64,
				IsCOD:       true,
				CODValue:    vShipment.CODValue.Float64,
			}

			tariff, err := c.coreSystemRepo.CheckTariffV3(ctx, req)
			if err != nil {
				ddlogger.Log(ctx, span, "[shipmentService-CreateShipmentCOD [coreSystemRepo.CheckTariffV3]]", err)
				errChan <- err
				return
			}
			statusCOD, err := c.route.FindStatusCODByOrigin(ctx, req.Origin)
			if err != nil {
				if err != sql.ErrNoRows {
					ddlogger.Log(ctx, span, "Find status cod destination and cod origin", err)
					errChan <- err
					return
				}
			}

			if statusCOD != nil {
				IsCODOrigin = statusCOD.IsCODOrigin
				IsCODDestination = statusCOD.IsCODDestination
			}
             ................
}
	wg1.Wait()
	close(shipmentChan)
	close(errChan)
	close(amountChan)

It looks like you just created the pointer, and it doesn't point to any memory spaces, you can check all the variables in your new code to find it. e.g. ctx