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 ('c8cd6031bb7dac219e89b09a0b2407b4', -1, 1729229083, 1729229083, '0385877e', 5, 0, 0)

Line : 195
File : sessions.php