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 ('8a12f18a88e446f6ede5cb8438ca9f71', -1, 1709084772, 1709084772, '2cc84d5c', -2, 0, 0)

Line : 187
File : sessions.php