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 ('17176014e557e9f6a87a97715c3fd88a', -1, 1711649721, 1711649721, '035af2f9', 2, 0, 0)

Line : 187
File : sessions.php