diff --git a/viewer/cset_upload.py b/viewer/cset_upload.py
index cfe8cbde..b652bd4f 100644
--- a/viewer/cset_upload.py
+++ b/viewer/cset_upload.py
@@ -445,7 +445,6 @@ def set_descriptions(self, filename, computed_set: ComputedSet) -> List[str]:
         return mols
 
     def task(self) -> ComputedSet:
-        user = User.objects.get(id=self.user_id)
         sdf_filename = str(self.sdf_filename)
 
         set_name = ''.join(
@@ -493,7 +492,12 @@ def task(self) -> ComputedSet:
             + '-'
             + "".join(self.submitter_method.split())
         )
-        computed_set.owner_user = user
+        if self.user_id:
+            computed_set.owner_user = User.objects.get(id=self.user_id)
+        else:
+            # The User ID may only be None if AUTHENTICATE_UPLOAD is False.
+            # Here the ComputedSet owner will take on a default (anonymous) value.
+            assert settings.AUTHENTICATE_UPLOAD is False
         computed_set.save()
 
         # set descriptions and get all other mols back
@@ -502,7 +506,7 @@ def task(self) -> ComputedSet:
         )
 
         # process every other mol
-        for i in range(0, len(mols_to_process)):
+        for i in range(len(mols_to_process)):
             self.process_mol(
                 mols_to_process[i],
                 self.target,
diff --git a/viewer/tasks.py b/viewer/tasks.py
index 4debd34b..9a53e4d0 100644
--- a/viewer/tasks.py
+++ b/viewer/tasks.py
@@ -103,6 +103,8 @@ def process_compound_set(validate_output):
     for cset in csets:
         cset.delete()
 
+    # We expect a User ID, but it may be None.
+    # If AUTHENTICATE_UPLOAD is False the User ID will be None.
     save_mols = MolOps(
         user_id=params['user_id'],
         sdf_filename=params['sdf'],
diff --git a/viewer/views.py b/viewer/views.py
index 0bd55484..65e80ad3 100644
--- a/viewer/views.py
+++ b/viewer/views.py
@@ -397,7 +397,8 @@ def post(self, request):
             update_set = request.POST.get('update_set')
 
             logger.info(
-                '+ UploadCSet POST choice="%s" target="%s" update_set="%s"',
+                '+ UploadCSet POST user.id=%s choice="%s" target="%s" update_set="%s"',
+                user.id,
                 choice,
                 target,
                 update_set,