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 ('848cb2d3d8dc39bbb9681c6992d083d1', -1, 1711629114, 1711629114, '12e8bc7a', 2, 0, 0)

Line : 187
File : sessions.php