node-ews: CreateItem & UpdateItem Firing "Max call stack size exceeded"

First off - great module! I was able to tweak it to get a lot of functions working with EWS correctly (including FindItem, GetItem, Subscribe, GetEvents, ResolveNames, and also Impersonation ). It only took some minor tweaks to the code, but for the most part the xml2js & node-soap/wsdl.js handle the functions perfectly. That is until CreateItem (or UpdateItem). For some reason the following error fires:

if (Array.isArray(parameterTypeObj.$lookupTypes) && parameterTypeObj.$lookupTypes.length) { ^

RangeError: Maximum call stack size exceeded at Function.isArray (native) at WSDL.findChildSchemaObject (/…/server/node-ews-rv/node-soap/lib/wsdl.js:1822:12) at WSDL.findChildSchemaObject (/…/server/node-ews-rv/node-soap/lib/wsdl.js:1862:20)

I can’t for the life of me figure out what about these functions causes the error. I know the call stack exceeding has to do with (most likely) recursive functions, and .findChildSchemaObject does fire within itself in WSDL.js, but this has no effect on any other EWS operations but CreateItem & UpdateItem.

Any thoughts?