diff --git a/app/models/champs/multiple_drop_down_list_champ.rb b/app/models/champs/multiple_drop_down_list_champ.rb
index 29ce06dcf..4f14f197b 100644
--- a/app/models/champs/multiple_drop_down_list_champ.rb
+++ b/app/models/champs/multiple_drop_down_list_champ.rb
@@ -94,8 +94,9 @@ class Champs::MultipleDropDownListChamp < Champ
   end
 
   def values_are_in_options
-    return if (json = JSON.parse(value) - ['']).empty?
-    return if json.filter { |val| enabled_non_empty_options.exclude?(val) }.empty?
+    json = JSON.parse(value).reject(&:blank?)
+    return if json.empty?
+    return if (json - enabled_non_empty_options).empty?
 
     errors.add(:value, :not_in_options)
   end