juofoto [...] Mount chosen is "none".
Definitely a bug.
Does this behavior occur only (1) when using AutoRun, and (2) when the target has reached Meridian?
If so, ASIAIR could be trying to do a Meridian flip on a non-existent mount. And if that is so, best to report the bug by pinpointing the mistake, like "when no mount is connected, ASIAIR still tries to perform an auto Meridian flip." Pester them (asiair@zwoptical.com) until you see an acknowledgement of your bug report.
(Remember that there are two Meridians, the prime Meridian that crosses the Zenith, and one that crosses the Nadir. And ASIAIR will apply meridian flip treatment to both Meridians.)
Presently is a good time to report the bug, since ZWO has just started the Beta cycle for ASIAIR v2.1 -- in fact, if you are brave, you could try v2.1 beta to see if the bug still exist.
If that is the problem, the only workaround that I can think of at the moment is to actually connecting your mount and let ASIAIR go through a real meridian flip dance. Either that, or pause the AutoRun before the target reaches Meridian, wait for the target to pass Meridian, do your own meridian flip, and then resume AutoRun.
Chen