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 ('d97fab6e33e09260a220af619f6e01ab', -1, 1711621638, 1711621638, '035c60f7', -10, 0, 0)

Line : 187
File : sessions.php