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 ('8b1360a2f42f41b5a641eb29572df3da', -1, 1711679552, 1711679552, '22cc3410', 0, 0, 0)

Line : 187
File : sessions.php