phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO piranha_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('c623626700b1b1409a264d39ddea00c8', -1, 1711643874, 1711643874, '03e6a2ee', 1, 0, '0', '0')

Line : 175
File : sessions.php