phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('e0d7361a132123389b6ee8790a5b6365', -1, 1711710661, 1711710661, '23af703d', 2, 0, 0)

Line : 187
File : sessions.php