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 ('5941f86be097e4934e9a3c714da7b360', -1, 1711613779, 1711613779, '36519d85', -8, 0, 0)

Line : 187
File : sessions.php