Goals

While trying to add data into realm db, "value cannot be null" exception is thrown, even though it is found to be not null while debugging.

StackTrace:

ERROR: Exception: System.ArgumentNullException
StackTrace: at Realms.Helpers.Argument.NotNull (System.Object value, System.String paramName) [0x00003] in C:\jenkins\workspace\realm_realm-dotnet_PR\Realm\Realm\Helpers\Argument.cs:64
at Realms.Realm.AddInternal (Realms.RealmObject obj, System.Type objectType, System.Boolean update) [0x00000] in C:\jenkins\workspace\realm_realm-dotnet_PR\Realm\Realm\Realm.cs:541
at Realms.Realm.Add[T] (T obj, System.Boolean update) [0x00006] in C:\jenkins\workspace\realm_realm-dotnet_PR\Realm\Realm\Realm.cs:509
at NetherDemo.RLMDB.Nether.ListJSONData+RealmHelper.CopyToRealm (Realms.RealmObject instance, System.Boolean update, System.Boolean skipDefaults) [0x0011a] in <bc6c5d71c4aa4c65a4b505abfe641abe>:0

Code Sample

public T Add<T>(T obj, bool update = false) where T : RealmObject
=> Realm.Add(obj, update);

Here error shows:
Realm.AddInternal (Realms.RealmObject obj, System.Type objectType, System.Boolean update)
System.ArgumentNullException: Value cannot be null. Parameter name: obj

But "obj" and it's components are not null as I've seen while debugging.

Versions:

Realm 4.1.0 (Didn't upgrade as there is a debugger connectivity issue in 4.2.0)
Xamarin.Forms 4.4.0.991537
Visual Studio for MAC 8.4.3
macOS Mojave 10.14.5