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 ('5d971f063e5ec7cb974989e4016d78c6', -1, 1713560989, 1713560989, '0389a4f1', -8, 0, 0)

Line : 187
File : sessions.php