Multiple author entry save error

[a-ntoine]

When creating an entry with multiple authors (author field with 'Allow selection of multiple authors') an error occur:

Duplicate entry '27' for key 'entry_id'
An error occurred while attempting to execute the following query
INSERT INTO sym_entries_data_19 (entry_id, author_id) VALUES ('27', '2'), ('27', '3')

[brendo]

Not to self, alter the UNIQUE KEY constraint so that it's a composite key of entry_id and author_id.