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 ('9f5c5c7540e7f1cd3e42872cbe7bb0f2', -1, 1714038040, 1714038040, '12bf2e24', -4, 0, 0)

Line : 187
File : sessions.php