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 ('299372d85a8bc8913ca3fb350a78b468', -1, 1709197766, 1709197766, '03ed2215', -8, 0, 0)

Line : 187
File : sessions.php