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 ('2446e5f8cc71d2756f376a7f913d11fb', -1, 1711695167, 1711695167, '36cc8eeb', -4, 0, 0)

Line : 187
File : sessions.php