Error when deleting a thirdparty having contacts with roles

[atm-maxime]

Bug

When trying to delete a thirdparty having contacts with roles, the following error occurs :
Cannot delete or update a parent row: a foreign key constraint fails (atm_dolibarr.llx_societe_contacts, CONSTRAINT fk_societe_contacts_fk_socpeople FOREIGN KEY (fk_socpeople) REFERENCES llx_socpeople (rowid))

Environment

• Version: 11.0.4
• OS: Linux
• Web server: Apache/2.4.29 (Ubuntu)
• PHP: apache2handler 7.2.24-0ubuntu0.18.04.4
• Database: 5.5.5-10.1.44-MariaDB-0ubuntu0.18.04.1
• URL(s): /societe/card.php?socid=20531&action=confirm_delete&confirm=yes&token=9fe36851fc402eec607a4c9c64513f18

Expected and actual behavior

The thirdparty and its contacts should be deleted. Currently nothing is deleted because of the error

Steps to reproduce the behavior

1. Create a thirdparty
2. Create a contact linked to the thirdparty, assign a role
3. Go back on the thirdparty card
4. Try to delete the thirdparty