Non-recoverable error - zonelist.lua attempt to compare nil with number

Just finished several sciences to unlock more zones / planets. Attempted to bring up universe explorer but it crashed instead.

Screenshot of error:

Link to save: https://drive.google.com/file/d/1mRsIJ_lnbf0Mxnw_RryopjEReN3psaaN/view?usp=share_link

Console:
[2022-11-24 15:58:58]: __space-exploration__/scripts/zonelist.lua:1476: in function <__space-exploration__/scripts/zonelist.lua:1474>[2022-11-24 15:58:58] [C]: : in function 'sort'[2022-11-24 15:58:58]: __space-exploration__/scripts/zonelist.lua:1485: in function 'update_list'[2022-11-24 15:58:58]: __space-exploration__/scripts/zonelist.lua:2273: in function 'update'[2022-11-24 15:58:58]: __space-exploration__/scripts/zonelist.lua:1210: in function 'open'[2022-11-24 15:58:58]: __space-exploration__/scripts/zonelist.lua:884: in function 'toggle'[2022-11-24 15:58:58]: __space-exploration__/scripts/zonelist.lua:2732: in function 'callback'[2022-11-24 15:58:58]: __space-exploration__/scripts/event.lua:15: in function <__space-exploration__/scripts/event.lua:13>"[2022-11-24 15:58:58] [46727.538]: Info ServerMultiplayerManager.cpp:795: updateTick(197996472) changing state from(InGame) to(Failed)[2022-11-24 15:58:58] [46727.551]: Quitting: multiplayer error.[2022-11-24 15:59:01] [46729.847]: Info ServerMultiplayerManager.cpp:141: Quitting multiplayer connection.