Reached the end of the tech tree, but the game asks me to research something

As the title says.

Ticket #DYO-864-10888

I can't complete my game.  I've researched all the techs, but I can go no further, the game won't let me change turns anymore.

This is new as of 6.1.

Link to file, in case i'm missing something obvious:

https://www.dropbox.com/s/zw7ocqkenn93fwh/bankrupt%20and%20end%20of%20tech%20tree.GC3Sav?dl=0