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 ('10ff991946f239ecd39f3f045bd65c88', -1, 1714108467, 1714108467, '0385a0f9', 6, 0, 0)

Line : 187
File : sessions.php