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 ('f5a01e9101a0b5f4f46ff1f8a3f2f1cb', -1, 1709592516, 1709592516, '2cc00ffb', -2, 0, 0)

Line : 187
File : sessions.php