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 ('feaf2c6a751e993f0eb6a796f8f0d1d8', -1, 1711633486, 1711633486, '36a33e2a', 2, 0, 0)

Line : 187
File : sessions.php