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 ('8b86334daccb139c4e1c77d79e189c03', -1, 1713960670, 1713960670, '12776b60', -4, 0, 0)

Line : 187
File : sessions.php