NilObjectException trying to access Inserted database

I have a program with an embedded database (via Insert->Database->Select SQLiteDatabase) that no longer works in 2015r4.
It compiles, no warnings or errors, and runs, but it throws the error when I try to access the database.
It runs fine under 2015r2.2

I’ve looked at release notes for all the in-between versions and can’t find anything.
Am I missing something that changed?

Make sure the database is still getting copied and included with the app.

There is no ‘copy’ on either build (2015r2.2 or 2015r4)