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 ('a25f4a6e51daf421736e20d6171b1d72', -1, 1711613891, 1711613891, '22e28dcf', -7, 0, 0)

Line : 187
File : sessions.php