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 ('f61898b80991ee9a97aa9ea4fb4b9c88', -1, 1714000841, 1714000841, '12755b99', -1, 0, 0)

Line : 187
File : sessions.php