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 ('7a82c6ba0d0e68e36b3ca387fd0e8a0f', -1, 1711699261, 1711699261, '3653b065', -7, 0, 0)

Line : 187
File : sessions.php