rate limiting w/ enterprise

[iskandari]

I have been trying to use the isochrone API to generate 10-minute walking isochrones using a list of coordinate pairs but my attempt fails even while iterating over a small number (such as 5) points. I have an enterprise account so should there should be a very high rate limit.

The script will execute the first time on 5 points, but on the second try and subsequent tries, it will throw the following error from isochrone.js :

            'data': resp.durations[0],
                        ^
      TypeError: Cannot read property 'durations' of undefined

If I include a geojson with many points (such as 100), it will fail every time.

Any ideas on how to solve this?
I have included both the geojson that I am iterating over and the modified index.js file below:

index.js

isochrone = require('./isochrone.js');
var turf = require('@turf/turf');
var fs = require('fs'),
obj

token = 'mytoken'

fs.readFile('poi.geojson', handleFile);
fts = []

function handleFile(err, data) {
    if (err) throw err
    obj = JSON.parse(data)
    features = obj.features
    console.log(features.length)

    for (var j = 0; j <features.length; j++) {

    	console.log(j)
	
		coords = features[j].geometry.coordinates

		isochrone(coords, {"token":token, "threshold":[600], "mode":"walking", batchSize:25}, function(err, output){
			
			if (err) console.log("not throwing error");
				
			output = output.features
			console.log(output)
			fts.push(output[0]);
			

			 if (j >= features.length){console.log('made it to the end')
			 	
		 	var collection = JSON.stringify({
			features: fts,
     	    type: 'FeatureCollection'
			});

		 	fs.writeFileSync('isochrones.geojson', collection);

			 }
		});	

   }

}

poi.geojson

{
"type": "FeatureCollection",
"name": "poi",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "stop_id": 6, "stop_name": "Jackson & Lotus", "stop_lat": 41.876513, "stop_lon": -87.761446 }, "geometry": { "type": "Point", "coordinates": [ -87.761446, 41.876513 ] } },
{ "type": "Feature", "properties": { "stop_id": 2, "stop_name": "5900 W Jackson", "stop_lat": 41.87706679, "stop_lon": -87.77131794 }, "geometry": { "type": "Point", "coordinates": [ -87.77131794, 41.87706679 ] } },
{ "type": "Feature", "properties": { "stop_id": 1, "stop_name": "Jackson & Austin Terminal", "stop_lat": 41.87632184, "stop_lon": -87.77410482000001 }, "geometry": { "type": "Point", "coordinates": [ -87.77410482, 41.87632184 ] } },
{ "type": "Feature", "properties": { "stop_id": 4, "stop_name": "5700 W Jackson", "stop_lat": 41.87702418, "stop_lon": -87.76745055000001 }, "geometry": { "type": "Point", "coordinates": [ -87.76745055, 41.87702418 ] } },
{ "type": "Feature", "properties": { "stop_id": 3, "stop_name": "Jackson & Menard", "stop_lat": 41.87695725, "stop_lon": -87.76975039 }, "geometry": { "type": "Point", "coordinates": [ -87.76975039, 41.87695725 ] } }
]
}