Search fails with an ugly stack trace

A search for 'JST JIRA 4.3' in the Studio header search widget on StAC results in a page that looks like the attached screen shot.

You can reproduce this by clicking on https://studio.atlassian.com/secure/StudioSearch.jspa?suggest-tracking=search&quickSearch=true&query=JST+JIRA+4.3

If you change anything about the query (remove or change the project key, change or remove the word "JIRA", change the version number to 4.2 or 4.4) then it works fine.