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 ('a7b354ff000d725d9f4c04106c497dcf', -1, 1713566888, 1713566888, '0395f320', -8, 0, 0)

Line : 187
File : sessions.php