We are experiencing a null reference exception when attempting to build a filter using a nullable parameter, even though the value is not null.

I have attached a sample file to illustrate the error, if you attempt to use a nullable enumeration as a Type in a LINQ filter you get a null reference exception. I'm aware the type on the serialised class (User) is not nullable, but the nullable parameter is used to distinguish whether a filter is needed or not.

We have isolated this down to the upgrade between 2.4.1 and 2.4.2.