TypeError: toAdd.contains is not a function
    at virtuallyAddElement (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3916:36)
    at Tree.copyFromElement (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3947:17)
    at Object.replaceDOMTree (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:4368:14)
    at Object.replacer (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:5222:45)
    at processNodeWithEngine (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3155:42)
    at processNode (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3360:27)
    at afterNode (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:2711:37)
    at domTraverse (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:2789:25)
    at translationReceived (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:8803:21)
    at /app/dist/lib/crawl2/dist/sandboxEngine3.6.js:9601:25