Merge pull request #837 from netbek/bugfix-asynckeys-indexof

Check if async keys is array before searching for error key #818

Author: davidkpiano

src/form/is-valid.js

@@ -18,7 +18,7 @@ export default function isValid(formState, options = { async: true }) {
       // current error key is an async validator key,
       // treat key as valid
       if (!options.async
-        && formState.asyncKeys
+        && Array.isArray(formState.asyncKeys)
         && !!~formState.asyncKeys.indexOf(errorKey)) {
         return true;
       }