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 ('6d46ab82e0f24263df143d4174d2041e', -1, 1709243308, 1709243308, '03ed2215', -4, 0, 0)

Line : 187
File : sessions.php