TypeError: Cannot read property 'map' of undefined
    at /home/musicbrainz/musicbrainz-server/root/instrument/List.js:56:16
    at Array.map (native)
    at InstrumentList (/home/musicbrainz/musicbrainz-server/root/instrument/List.js:52:26)
    at resolve (/home/musicbrainz/musicbrainz-server/node_modules/react-dom/cjs/react-dom-server.node.development.js:2102:14)
    at ReactDOMServerRenderer.render (/home/musicbrainz/musicbrainz-server/node_modules/react-dom/cjs/react-dom-server.node.development.js:2260:22)
    at ReactDOMServerRenderer.read (/home/musicbrainz/musicbrainz-server/node_modules/react-dom/cjs/react-dom-server.node.development.js:2234:19)
    at Object.renderToStaticMarkup (/home/musicbrainz/musicbrainz-server/node_modules/react-dom/cjs/react-dom-server.node.development.js:2512:25)
    at getResponse (/home/musicbrainz/musicbrainz-server/root/server/response.js:69:31)
    at /home/musicbrainz/musicbrainz-server/root/server/createServer.js:69:31
    at bound (domain.js:280:14)
    at runBound (domain.js:293:12)
    at Socket.<anonymous> (/home/musicbrainz/musicbrainz-server/root/server/createServer.js:73:9)
    at bound (domain.js:280:14)
    at Socket.runBound (domain.js:293:12)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:191:7)
    at readableAddChunk (_stream_readable.js:178:18)
    at Socket.Readable.push (_stream_readable.js:136:10)
    at Pipe.onread (net.js:560:20)