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 ('e5d635e43cb5403d82966a16f725291c', -1, 1708735214, 1708735214, '641ac4de', -4, 0, 0)

Line : 187
File : sessions.php