Build Folder exists but is empty

[mischnic]

BuildInfo.js:75 Uncaught (in promise) TypeError: Cannot read property 'start' of null
    at BuildInfo.js:75
    at Array.map (<anonymous>)
    at props.fetch.then.then.t.setState.loading (BuildInfo.js:74)
    at <anonymous>

buildslist:

{
    build: null,
    commit: {...},
}