invalid_cursor_name Invalid Cursor Name — SQLSTATE 34000

The named cursor does not exist.

• The error is written to the server log and returned to the client carrying SQLSTATE 34000.
• Any driver (libpq, JDBC, psycopg, npgsql, pgx) surfaces this code in its error object so you can branch on it programmatically.
• PL/pgSQL can trap it by name: EXCEPTION WHEN invalid_cursor_name THEN.

Severity: ERROR  |  PostgreSQL versions: 12, 13, 14, 15, 16, 17

Reproduce with the exact statement and read the full message in the server log (raise log_min_messages / set log_min_error_statement for more context).

A FETCH/CLOSE referenced a cursor that was never declared or has already closed.

Steps to resolve 34000:

1. DECLARE the cursor before FETCH/CLOSE.
2. Keep it in the same transaction — non-holdable cursors close at COMMIT.

Reference: PostgreSQL error codes — Class 34 (Invalid Cursor Name).