diff --git a/app/models/metadata_belongs_to.rb b/app/models/metadata_belongs_to.rb
index e1b84438..8726f1b1 100644
--- a/app/models/metadata_belongs_to.rb
+++ b/app/models/metadata_belongs_to.rb
@@ -41,7 +41,7 @@ class MetadataBelongsTo < MetadataRelatedPosts
     # anterior
     if belonged_to.present?
       if belonged_to[inverse].respond_to? :has_one
-        belonged_to[inverse].value = nil
+        belonged_to[inverse].value = ''
       else
         belonged_to[inverse].value = belonged_to[inverse].value.reject do |rej|
           rej == post.uuid.value
diff --git a/app/models/metadata_has_one.rb b/app/models/metadata_has_one.rb
index 239bf2e8..93aaba50 100644
--- a/app/models/metadata_has_one.rb
+++ b/app/models/metadata_has_one.rb
@@ -17,8 +17,8 @@ class MetadataHasOne < MetadataBelongsTo
     return true unless changed?
     return true unless inverse?
 
-    had_one&.value = nil
-    has_one&.value = post.uuid.value
+    had_one[inverse]&.value = ''
+    has_one[inverse]&.value = post.uuid.value
 
     true
   end