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 ('68aa87e576d3a716f327b69f9667a656', -1, 1714843978, 1714843978, '12bfb5e7', -4, 0, 0)

Line : 187
File : sessions.php