[Vuejs]-Why does error message pops up for some time when validator method returns true?

Just figured this out. For whatever reason, while the async method is away doing its thing the custom validation property (in my case ‘unique’) gets set to false for a split second. I also noticed during this split second that $pending also gets set to true before going back to false. So – by combing both in your if statement you should be able to prevent your error message popping up for that split second.
something like:

v-if="!$v.email.unique && !$v.email.$pending"