TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at Node.get (/app/src/engine40/serverSideEngine.js:136:40)
    at root.__proto__.hasAttribute (/app/src/engine40/serverSideEngine.js:148:33)
    at beforeNode (/app/dist/lib/crawl2/dist/sandboxEngine3.5.js:4203:33)
    at traverse (/app/dist/lib/crawl2/dist/sandboxEngine3.5.js:4091:41)
    at Object.mapSegments (/app/dist/lib/crawl2/dist/sandboxEngine3.5.js:4197:9)
    at domTraverse (/app/dist/lib/crawl2/dist/sandboxEngine3.5.js:2590:33)
    at translationReceived (/app/dist/lib/crawl2/dist/sandboxEngine3.5.js:8802:21)
    at /app/dist/lib/crawl2/dist/sandboxEngine3.5.js:9600:25
    at onReady (/app/dist/lib/crawl2/dist/sandboxEngine3.5.js:10102:5)