[Koha] Patron with checked out items with no information

[clint.deckard]

I have a patron that has a number of checked out items, three of which 
are blank/have no details ie. when viewing overdue items there are no 
details for three of the items.
When listing checked out items for this patron it just sits trying to 
load them.
I can't find any similar problem in bugs or the web.
How can I correct the problem?

This was originally a 3.20 version and migrated to 17.11 on Debian using 
MySQL.
There are no problems listed in 'System Information' on the 'About Koha' 
page.

Appreciate the help,
Clint.