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 ('e0af50df9456f3d3d0004418f51c8dc1', -1, 1714029720, 1714029720, '127783b2', -8, 0, 0)

Line : 187
File : sessions.php