New Plugin: AddressBook

Hi,
the plugin now shows up, but breaks the “configure this project page” with the following error at the bottom of the page (even css styles are not loaded anymore) :
Internal Error: SQL Error[42803]: SQLSTATE[42803]: Grouping error: 7 ERROR: column “address_book_contacts_contact.item_id” must appear in the GROUP BY clause or be used in an aggregate function LINE 1: SELECT * FROM “address_book_contacts_contact” LEFT JOIN "ad… ^

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