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 ('56b1ae8a218c9c805e479370d13d0834', -1, 1713517097, 1713517097, '0315686d', -4, 0, 0)

Line : 187
File : sessions.php