diff --git a/core/server/api/v2/utils/serializers/output/utils/members.js b/core/server/api/v2/utils/serializers/output/utils/members.js
index <HASH>..<HASH> 100644
--- a/core/server/api/v2/utils/serializers/output/utils/members.js
+++ b/core/server/api/v2/utils/serializers/output/utils/members.js
@@ -47,6 +47,7 @@ const forPost = (attrs, frame) => {
 
         if (!origInclude || !origInclude.includes('tags')) {
             delete attrs.tags;
+            attrs.primary_tag = null;
         }
     }
Removed serving primary_tag when members is enabled

no issue

- Content API v2 served primary_tag by default if members flag is enabled
- reference: <URL>