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 ('3ce0149c5013599bd18be03d1c15e574', -1, 1714003787, 1714003787, '0315e7f5', -4, 0, 0)

Line : 187
File : sessions.php