diff --git a/lib/validate.js b/lib/validate.js
index 858e4f85..1baa31c9 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -531,7 +531,7 @@ export const settingsSchema = object({
   diagnostics: boolean(),
   noReferralLinks: boolean(),
   hideIsContributor: boolean(),
-  zapUndos: intValidator.required('required').min(0, 'must be greater or equal to 0')
+  zapUndos: intValidator.nullable().min(0, 'must be greater or equal to 0')
 })
 
 const warningMessage = 'If I logout, even accidentally, I will never be able to access my account again'