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 ('0287888f29991463e8b7b915495e5614', -1, 1709624104, 1709624104, '2cc84d5c', 0, 0, 0)

Line : 187
File : sessions.php