That’s ok - it’s been on my list to get back to, I just hadn’t gotten there yet. 
Thanks for digging into the code! (For the record, that’s C# code with the .NET framework, mono is the tool that lets .NET run on Linux/MacOS.)
From what version did you update to 2.0.4.1? If it’s 2.0.3.12 or newer, you could try downgrading and see if the error goes away. That could tell us if it’s an issue stored in the database or just in the code.