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 ('6b1ed1e756c208f7f8c506848a7d8441', -1, 1713448914, 1713448914, '0391a508', -7, 0, 0)

Line : 187
File : sessions.php