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 ('b371e9a4089ac911f615400dd2ca5b17', -1, 1714352861, 1714352861, '0a020003', -9, 0, 0)

Line : 187
File : sessions.php