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 ('f5795732c8381df183c2a0b9461a4566', -1, 1711649404, 1711649404, '2ccab776', -4, 0, 0)

Line : 187
File : sessions.php