diff --git a/app/models/metadata_has_and_belongs_to_many.rb b/app/models/metadata_has_and_belongs_to_many.rb
index b32ce7c..905000e 100644
--- a/app/models/metadata_has_and_belongs_to_many.rb
+++ b/app/models/metadata_has_and_belongs_to_many.rb
@@ -12,7 +12,7 @@
 # diferencia entre has_many y belongs_to.
 class MetadataHasAndBelongsToMany < MetadataBelongsTo
   def default_value
-    super || []
+    []
   end
 
   # Posts a los que pertenece.  Memoizamos por value para obtener