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 ('9d9a2b5a6b42d12c2329ce7472ae6961', -1, 1711691639, 1711691639, '03ebb4f5', -7, 0, 0)

Line : 187
File : sessions.php