Javascript error when profiling queries

When viewing profiling results for any query, e.g.:

vector = scan(dwt2E24);
store(vector, transform);

No visualization is displayed, and I am getting the following Javascript error on line 58 of graph.js: Cannot read property 'forEach' of null.

Moving up the call stack, I see that fragments = null is being explicitly set in the script block embedded in /profile?queryId=X:

    <script async defer>
        d3.select('.query-plan').each(function() {
            var element = d3.select(this);
            var queryStatus = {"language": "myrial", "startTime": "2015-04-08T15:49:31.254Z", "queryId": 43, "finishTime": "2015-04-08T15:49:53.334Z", "submitTime": "2015-04-08T15:49:31.235Z", "url": "http://ec2-52-4-99-252.compute-1.amazonaws.com:8753/query/query-43", "subqueryId": 0, "logicalRa": "Store(public:adhoc:transform)[Scan(public:adhoc:dwt2E24)]", "rawQuery": "vector = scan(dwt2E24);\nstore(vector, transform);", "ftMode": "NONE", "message": null, "plan": {"type": "SubQuery", "fragments": [{"workers": [1, 2, 3, 4, 5, 6, 7, 8], "overrideWorkers": null, "operators": [{"opId": 0, "opType": "TableScan", "relationKey": {"userName": "public", "relationName": "dwt2E24", "programName": "adhoc"}, "opName": "MyriaScan(public:adhoc:dwt2E24)", "storedRelationId": null}, {"opId": 1, "argOverwriteTable": true, "relationKey": {"userName": "public", "relationName": "transform", "programName": "adhoc"}, "connectionInfo": null, "argChild": 0, "indexes": null, "opType": "DbInsert", "opName": "MyriaStore(public:adhoc:transform)"}], "fragmentIndex": 0}]}, "status": "SUCCESS", "profilingMode": ["QUERY", "RESOURCE"], "elapsedNanos": 22079420661};
            var fragments = null;
            theGraph = queryGraphInteractive(element, queryStatus, fragments);
        });

        $(function() {
            $('.show-overview').click(function(event) {
                event.preventDefault();
                theGraph.unfocus();
                theGraph.openOverview();
            });
        });
    </script>

Reproduction URI (which may be terminated at any time): http://ec2-52-4-99-252.compute-1.amazonaws.com/profile?queryId=43

Note that this is occurring on an EC2 cluster and so may be configuration-related.

uwescience / myria-web

Javascript error when profiling queries #282