diff --git a/rattail_nationbuilder/importing/nationbuilder.py b/rattail_nationbuilder/importing/nationbuilder.py
index 43cbf9a..00d3d59 100644
--- a/rattail_nationbuilder/importing/nationbuilder.py
+++ b/rattail_nationbuilder/importing/nationbuilder.py
@@ -119,6 +119,8 @@ class NationBuilderCachePersonImporter(FromNationBuilder, nationbuilder_importin
                 tags = data['tags']
                 if tags:
                     data['tags'] = self.config.make_list_string(tags)
+                else:
+                    data['tags'] = None
 
             if self.fields_active(self.primary_address_fields):
                 address = person.get('primary_address')