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 ('b8f23802d1d4fd26737d28ce0c4a5e69', -1, 1713893958, 1713893958, '0391ba06', -4, 0, 0)

Line : 187
File : sessions.php