LINQ to SQLite Cannot Update: "Store update, insert, or delete statement affected an unexpected number of rows"

With System.Data.SQLite and LINQ to Entities, I'm unable to do a simple update.

This code

using (Entities context = new Entities()) {
    var Obj = context.MyTable.Where(m => m.Title.StartsWith("Alaska")).FirstOrDefault();
    Obj.Artist = "A";
    context.SaveChanges();
}

Throws this exception

A first chance exception of type 'System.Data.Entity.Infrastructure.DbUpdateConcurrencyException' occurred in EntityFramework.dll

Additional information: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

How can I fix this?

I'm in an isolated test project so there's nothing else going on around it.