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 ('820cc4533be805324c9fd4f9929e6348', -1, 1708471845, 1708471845, '2cc014f0', -2, 0, 0)

Line : 187
File : sessions.php