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 ('df689dc3d0bb43a4ae963df1828b0bf6', -1, 1708797963, 1708797963, '03eb916c', -10, 0, 0)

Line : 187
File : sessions.php