No graph with `TypeError: cannot read property 'elapsed' of null`

[awochna]

I think this has to do with the fact that one of the benchmarks in the comparison has a test that the other does not. The mix bench.cmp command handled this just fine, but the mix bench.graph command results in an HTML page that doesn't display a graph.

The full error from the JS console:

Uncaught TypeError: Cannot read property 'elapsed' of null
    at file:///home/awynter/projects/personal/breaker/bench/graphs/index.html:168:42
    at Function.m.map.m.collect (http://underscorejs.org/underscore-min.js:5:2566)
    at m.(anonymous function) [as map] (http://underscorejs.org/underscore-min.js:5:15545)
    at make_comparison_chart (file:///home/awynter/projects/personal/breaker/bench/graphs/index.html:168:10)
    at add_comparison_chart (file:///home/awynter/projects/personal/breaker/bench/graphs/index.html:157:5)
    at redrawCharts (file:///home/awynter/projects/personal/breaker/bench/graphs/index.html:320:5)
    at HTMLDocument.<anonymous> (file:///home/awynter/projects/personal/breaker/bench/graphs/index.html:329:5)
    at j (http://code.jquery.com/jquery-2.1.1.min.js:2:26860)
    at Object.fireWith [as resolveWith] (http://code.jquery.com/jquery-2.1.1.min.js:2:27673)
    at Function.ready (http://code.jquery.com/jquery-2.1.1.min.js:2:29467)

The snapshots are put into a gist: https://gist.github.com/awochna/9e010affe57ad9df6ffbdaf144f6c9fa

[florius0]

I've encountered the same problem.

    var snapshotCount;
    for (var key in categories) {
        snapshotCount = categories[key].length;
        break;
    }
...
    for (var i = 0; i < snapshotCount; i++) {
        // Go through the ith snapshot of each category
        var sample = _.map(categories, function(snapshots, key) {
            var val = snapshots[i];
            return {cat: key, val: val.elapsed / val.n};
        });

I've noticed that snapshotCount between categories varies. And the way it calculates it now, it may not be correct for every category.