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 ('d1d15cdb4555db98140610c09de8ce6d', -1, 1714000770, 1714000770, '1275b6b3', -4, 0, 0)

Line : 187
File : sessions.php