Downloading of yearly report throws error

[gcomte]

As an admin, on the "Employees" page, you can pick a user, and then on the bottom of that page, there are links for downloading yearly reports. When clicking one of the given links, the following error message appears:

Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long'; nested exception is java.lang.NumberFormatException: For input string: "undefined"