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 ('3ee4d5ff3679e6ca5b5ef88170ee2a02', -1, 1711642994, 1711642994, '23afac5e', -4, 0, 0)

Line : 187
File : sessions.php