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 ('424c3bf17b1344044a4740029657f7f1', -1, 1711647643, 1711647643, '12d1d11c', 6, 0, 0)

Line : 187
File : sessions.php