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 ('ed4703d7312b2a1e3104566666243ce6', -1, 1714005950, 1714005950, '030f2e0d', -4, 0, 0)

Line : 187
File : sessions.php