previous_page null check

app/models/case_log.rb

@@ -20,9 +20,11 @@ class CaseLogValidator < ActiveModel::Validator
 
   def validate(record)
     question_to_validate = options[:previous_page]
+    if question_to_validate.present?
       public_send("validate_#{question_to_validate}", record)
     end
   end
+end
 
 class CaseLog < ApplicationRecord 
   validate :instance_validations