NullReferenceException on Discriminated Union serialization

[kagetoki]

Consider DU:

type Claim = Read | Edit | Delete | Custom of string

Sometimes during serialization I get NullReferenceException, no matter the case.
Issue is present both for compact and standard modes.
It's a floating issue, I haven't noticed any pattern of it's reproducing

[blumu]

Thanks for reporting. On which version does this happen?
Could you also share the full call stack? @kagetoki

[blumu]

@kagetoki Closing this old bug. Feel free to reopen if this still reproes and if you can provide the requested information.