Well, I think I chanced upon a trivial bug deriving from an apparent typo...

Now is that OLOSEBATTLE supposed to be '
go-close-battle' or '
close-battle', or am I just jumping to conclusions?
I did also hit a similar error msg about a 'core plot deadend' (methinks I got too disinterested with my replies in the opening convo - the msg was right after finishing it) but it was quick trial of something and I didn't think to PrtScr it.

EDIT: Well, the same (or a very similar) 'plot deadend in core story' msg came up just as I finished off an invader(s) attacked my 'home station'.

Hope this helps (or maybe is something I shouldn't worry about

)