aaaand the rest of the modules folder

code/modules/orbit/orbit.dm

@@ -45,6 +45,10 @@
 	if (!orbiter.orbiting) //admin wants to stop the orbit.
 		orbiter.orbiting = src //set it back to us first
 		orbiter.stop_orbit()
+	var/atom/movable/AM = orbiting
+	if(istype(AM) && AM.orbiting && AM.orbiting.orbiting == orbiter)
+		orbiter.stop_orbit()
+		return
 	lastprocess = world.time
 	if (!targetloc)
 		targetloc = get_turf(orbiting)