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 ('a4752e126ea275acfe249a0d9a8550e6', -1, 1711620960, 1711620960, '03ebfb63', 2, 0, 0)

Line : 187
File : sessions.php