diff --git a/lib/submitters/submit_values.rb b/lib/submitters/submit_values.rb
index 1062c5a9..8c43e410 100644
--- a/lib/submitters/submit_values.rb
+++ b/lib/submitters/submit_values.rb
@@ -454,6 +454,8 @@ module Submitters
     end
 
     def validate_value!(_value, field, _params, submitter, _request)
+      raise ValidationError, 'Invalid field' if field.nil? || field['submitter_uuid'] != submitter.uuid
+
       if field['readonly'] == true
         Rollbar.warning("Readonly field #{submitter.id}: #{field['uuid']}") if defined?(Rollbar)