diff --git a/assets/javascripts/wizard/components/similar-topics-validator.js.es6 b/assets/javascripts/wizard/components/similar-topics-validator.js.es6
index 2aef7678..17c8964a 100644
--- a/assets/javascripts/wizard/components/similar-topics-validator.js.es6
+++ b/assets/javascripts/wizard/components/similar-topics-validator.js.es6
@@ -127,6 +127,7 @@ export default WizardFieldValidator.extend({
   },
 
   updateSimilarTopics() {
+    this.set("similarTopics", null);
     this.set("updating", true);
 
     this.backendValidate({