Pressing "Block details" button from Renewals is causing system crash

Holly found this error while checking something else out on http://folio-q4-core.aws.indexdata.com. She was able to recreate the error several times on Sunday.

1. To test this you need to first checkout an item to a patron and then enter a patron block for that same patron.
2. Then go to the patron's open loans and do a renewal, which will be blocked (as shown in attached screen print Blocked-from-renewal.jpg).
3. Press the Block details button to get more information about the block, which is what most users will do, and a system error occurs (as shown in attached screen print System-error.jpg).

Important note: When Holly presses the "Block details" button from Checkout and Requests she does NOT get this error. It only happens within Renewals.