When creating a new section, while running eZ Publish with a Postgres database, the debug returns the following

Warning: PHP: E_WARNING

pg_query(): Query failed: ERROR: invalid input syntax for integer: ""
LINE 2: ...ezsection WHERE identifier='find_test' AND id != '' ORDER B...
^ in /var/www/ezp/.run/lib/ezdb/classes/ezpostgresqldb.php on line 197

Error: eZPostgreSQLDB

Error: error executing query: SELECT id, name, navigation_part_identifier, locale, identifier
FROM ezsection WHERE identifier='find_test' AND id != '' ORDER BY name ASC: ERROR: invalid input syntax for integer: ""
LINE 2: ...ezsection WHERE identifier='find_test' AND id != '' ORDER B...
^

this only happens if the first try fails.

Steps to reproduce

Setup - Add section

1. Log in as admin in admin interface
2. Click "Setup" in top menu
3. Click "Sections" in left menu
4. Click "New section" button
Name : Find test

5. Click "OK" button
6. Verify it throws an error "Identifier can not be empty"
7. Type the following:
Name: Find test
Identifier: find_test

8. Press "ok" button