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 ('4f0b68953c51f21c4c56f50f7c68d800', -1, 1711620704, 1711620704, '345a2854', 2, 0, 0)

Line : 187
File : sessions.php