REST API searching customObject data

Using the tool at: https://secure.p03.eloqua.com/api/docs/Dynamic/Rest/1.0/Reference.aspx

I'm attempting to search through customObject records using the GET command like:

/data/customObject/{id}?count={count}&page={page}&search={search}&orderBy={orderBy}&lastUpdatedAt={lastUpdatedAt}

This works like a charm if I leave the 'search' parameter empty, but any other value causes a 500 error like:

  There was an internal server error.
  

  The error has been logged with log identifier 102142565.
  

  Please provide this log identifier to technical support.