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 ('04bdf6a4da4a0e8b1b6c004f91817944', -1, 1711639636, 1711639636, '0353512a', -6, 0, 0)

Line : 187
File : sessions.php