diff --git a/ormar/models/model.py b/ormar/models/model.py
index 264c6a2..4eb0c29 100644
--- a/ormar/models/model.py
+++ b/ormar/models/model.py
@@ -191,7 +191,7 @@ class Model(ModelRow):
             value = [value]
 
         for val in value:
-            if not val.saved or save_all:
+            if (not val.saved or save_all) and not val.__pk_only__:
                 await val.upsert()
                 update_count += 1
             if follow:
diff --git a/tests/test_queries/test_deep_relations_select_all.py b/tests/test_queries/test_deep_relations_select_all.py
index 7cef48e..948b81f 100644
--- a/tests/test_queries/test_deep_relations_select_all.py
+++ b/tests/test_queries/test_deep_relations_select_all.py
@@ -155,4 +155,4 @@ def create_test_database():
 async def test_saving_related_fk_rel():
     async with database:
         async with database.transaction(force_rollback=True):
-            await Report.objects.select_all(follow=True).all()
\ No newline at end of file
+            await Report.objects.select_all(follow=True).all()