1.55 Trader ship causing hangup

When I established a trade route with Minor Civ, a trader ship appeared and started heading towards the same planet.  I cannot control it.  

When it gets there the game goes into an unbreakable loop with the following message.  Game save just before this happens attached.

https://www.dropbox.com/s/ehbnon1myyy7ddp/Supernova%20Insider%201.55.376650.2006.GC4Sav?dl=0

Here is a save before original Freighter goes to planet - the sequence above will happen every time you open a trade route.

https://www.dropbox.com/s/fu5c2uzu553rcr2/Supernova%20Insider%201.55.376650.2007.GC4Sav?dl=0