Measure angle test result: Angle = -nan(ind)

If I use the Angle command with TwoObjects option on this planar curve and planar surface I get a result of -nan(ind). What does that mean?

201127 AngleTwoObjects.3dm (207.7 KB)
When I move them closer to the origin I get an angle of 90, but these objects are only 5000 units away from the origin.

Hello -nan= Not A Number… looks buggy to me, thanks, I’ll get it on the pile.