Thanks for the save, reproduced the crash.
It crashes when it tries to draw the Hybrasil star, the rendering of it you see through the jump point.
The reason it crashes is it's looking for a texture with this filename:
graphics/planets/star_white.jpg
However, in Nexerelin's planets.json, star_white has the following texture defined for it:
graphics/exerelin/planets/star_texture_white.jpg
I'm not sure how this mismatch might have come about. Did this save go through several versions of Nexerlin, from a version where it wasn't providing a star_white definition, to one where it did? That's the only possibility that comes to mind.