PostgreSQL error code

PostgreSQL error 3B001

3B001 is the SQLSTATE PostgreSQL reports for invalid savepoint specification, in class 3B, Savepoint Exception.

SQLSTATE	3B001
Condition name	invalid_savepoint_specification
Class	3B — Savepoint Exception

Reproduce it, then fix it

You can only roll back to a savepoint that was set earlier in the same transaction. Run the broken query to see the error, then switch to the fixed one. Edit either freely; every run is rolled back.

ROLLBACK TO SAVEPOINT before_update;

SAVEPOINT before_update;
UPDATE products SET price = 0;
ROLLBACK TO SAVEPOINT before_update;
SELECT id, price FROM products ORDER BY id LIMIT 3;

Source: PostgreSQL documentation, Appendix A