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 ('79207c7e7f03ab9715a0dc4ba8b1b759', -1, 1714026811, 1714026811, '0391cea9', 3, 0, 0)

Line : 187
File : sessions.php