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 ('f615533d4fd654b4630eca3bf5a6e0a4', -1, 1711718604, 1711718604, '36eae99d', -8, 0, 0)

Line : 187
File : sessions.php