New request for patron with a block causes system error

While attempting to test UIU-804 at https://folio-snapshot.aws.indexdata.com, Holly experienced the same problems with requests that she had at https://folio-snapshot-stable.aws.indexdata.com/ and https://folio-testing.aws.indexdata.com/. On closer evaluation, Holly discovered that the problem lies with the patron block code and not the request process. If a patron does not have a block, you can do a request without incident. If the patron does have a block, a system error occurs. It worked at one point, but has stopped working now. Requesting using the Create Request button from within User Information or the New button from within Requests both cause the error.

The attached file Renewing-steps-for-patron-without-blocks.pdf shows the steps for a patron who does not have a block. This is successful.
The attached file Renewing-steps-for-patron-with-blocks.pdf shows what happens for a patron who does have a block. This is not successful.

This needs to be fixed before the code freeze on June 12, which is why I have given it a priority of P1. Please contact Holly is you need her to walk-thru this issue.