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 ('6e0a661aae402447fb14b6b9baf2f456', -1, 1711642222, 1711642222, '03ed33eb', -4, 0, 0)

Line : 187
File : sessions.php