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 ('f37ac492b4e6162f27196135e4851a1d', -1, 1711724978, 1711724978, '03ec8afd', 3, 0, 0)

Line : 187
File : sessions.php