Array overflow in AjaxServer.js within orbeon-3.9.0.rc1.201103220245-CE

Please fix this error in AjaxServer.js in the next build:
This line causes JavaScript error: nodeType is null, only in IE.

for (var childId = 0; caseBeginParent.childNodes.length; childId++)

After editing the line this way, recompiling the orbeon source, the JavaScript error went away
for (var childId = 0; childId < caseBeginParent.childNodes.length; childId++)