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 ('911e0a4a70a9f2f418bfe78082860b59', -1, 1714003563, 1714003563, '12760cde', 0, 0, 0)

Line : 187
File : sessions.php