The sun's sphere of influence is being returned as infinity which is not valid JSON:

"b.name[0]":"Sun","b.radius[0]":261600000,"b.soi[0]":infinity

I don't believe there's a portable way to represent an infinite value in JSON, unfortunately.

In addition, requesting orbital parameters for the Sun (such as b.o.period) results in "null messages" being sent ({})

(although, fortunately, b.o.gravParameter[0] works)