Need help with bytea data type from PostgreSQL.

[Suliman via Digitalmars-d-learn]

With:
x = row[0].as!(ubyte[]);

I am getting error:

core.exception.AssertError at C:\D\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(1920): Called `get' on null Nullable!ubyte[].