Issue with exporting data from custom connector

When attempting to export the data from a custom connector via the data process section and checking the box "Create/Update Dataset" I am able to do so up until my second loop. I successfully export data to Domo when I don't include the second for loop in the datagrid build below and am not sure why that is the case. When I do add the second for loop I end up getting redirected to the following page: https://api.domo.com/Error%20adding%20data%20to%20stream%20664.%20ApiData%20response%20400

httprequest.addHeader(
'Authorization',
'Bearer ' + metadata.account.accesstoken
);
httprequest.addHeader('Accept', 'application/json');

var count_query = encodeURIComponent('select count(*) from bill');
var count_res = httprequest.get(
'https://quickbooks.api.intuit.com/v3/company/123146138190659/query?query=' +
count_query
);
var total_count = JSON.parse(count_res).QueryResponse.totalCount;

//DOMO.log('total count ' + total_count);

var total_pages = Math.ceil(total_count / 1000);
var bills = [];

for (var i = 0; i < total_pages; i++) {
var startposition;
if (i == 1) {
startposition = 1;
} else {
startposition = i * 1000;
}
var bill_query = encodeURIComponent(
'select * from bill startposition ' + startposition + ' maxresults 1000'
);
var res = httprequest.get(
'https://quickbooks.api.intuit.com/v3/company/123146138190659/query?query=' +
bill_query
);
var me = JSON.parse(res);
bills = bills.concat(me.QueryResponse.Bill);
}

//DOMO.log('res: ' + count_res);
//DOMO.log('res: ' + res);
//DOMO.log(me.QueryResponse.totalCount);
//DOMO.log(me.QueryResponse.maxResults);
//DOMO.log(bills.length);
//DOMO.log('me: ' + me.QueryResponse.Bill);
//DOMO.log('metadata.reportname: ' + metadata.report);

datagrid.addColumn('DocNumber', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('SyncToken', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('domain', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('APAccountRef_name', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('APAccountRef_value', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('VendorRef_name', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('VendorRef_value', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('TxnDate', datagrid.DATA_TYPE_DATE);
datagrid.addColumn('TotalAmt', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('CurrencyRef_name', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('CurrencyRef_value', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('PrivateNote', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('DueDate', datagrid.DATA_TYPE_DATE);
datagrid.addColumn('sparse', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('LineDetailType', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('LineAmount', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('LineId', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('TaxCodeRef_value', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('AccountRef_name', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('AccountRef_value', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('BillableStatus', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('Description', datagrid.DATA_TYPE_STRING);
datagrid.addColumn('Balance', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('Id', datagrid.DATA_TYPE_DOUBLE);
datagrid.addColumn('MetaData_CreateTime', datagrid.DATA_TYPE_DATETIME);
datagrid.addColumn('MetaData_LastUpdatedTime', datagrid.DATA_TYPE_DATETIME);

var data = bills;

for (var i = 0; i < data.length; i++) {
datagrid.addCell(data[i].DocNumber);
datagrid.addCell(data[i].SyncToken);
datagrid.addCell(data[i].domain);
datagrid.addCell(data[i].APAccountRef.name);
datagrid.addCell(data[i].APAccountRef.value);
datagrid.addCell(data[i].VendorRef.name);
datagrid.addCell(data[i].VendorRef.value);
datagrid.addCell(data[i].TxnDate);
datagrid.addCell(data[i].TotalAmt);
datagrid.addCell(data[i].CurrencyRef.name);
datagrid.addCell(data[i].CurrencyRef.value);
datagrid.addCell(data[i].PrivateNote);
datagrid.addCell(data[i].DueDate);
datagrid.addCell(data[i].sparse);
for (var j = 0; j < data[i].Line.length; j++){
datagrid.addCell(data[i].Line[j].DetailType);
datagrid.addCell(data[i].Line[j].Amount);
datagrid.addCell(data[i].Line[j].Id);
datagrid.addCell(data[i].Line[j].AccountBasedExpenseLineDetail.TaxCodeRef.value);
datagrid.addCell(data[i].Line[j].AccountBasedExpenseLineDetail.AccountRef.name);
datagrid.addCell(data[i].Line[j].AccountBasedExpenseLineDetail.AccountRef.value);
datagrid.addCell(data[i].Line[j].AccountBasedExpenseLineDetail.BillableStatus);
datagrid.addCell(data[i].Line[j].Description);
}
datagrid.addCell(data[i].Balance);
datagrid.addCell(data[i].Id);
datagrid.addCell(data[i].MetaData.CreateTime);
datagrid.addCell(data[i].MetaData.LastUpdatedTime);
datagrid.endRow();
}