TypeError: toAdd.contains is not a function
    at virtuallyAddElement (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3917:36)
    at Tree.copyFromElement (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3948:17)
    at Object.replaceDOMTree (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:4369:14)
    at Object.replacer (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:5223:45)
    at processNodeWithEngine (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3156:42)
    at processNode (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:3361:27)
    at afterNode (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:2712:37)
    at domTraverse (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:2790:25)
    at translationReceived (/app/dist/lib/crawl2/dist/sandboxEngine3.6.js:8804:21)
    at /app/dist/lib/crawl2/dist/sandboxEngine3.6.js:9602:25