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 ('a20c1d1f4a0c7f5ce4ac9f6e88a2a785', -1, 1711626124, 1711626124, '2cc08442', -9, 0, 0)

Line : 187
File : sessions.php