diff --git a/.gitignore b/.gitignore
index 2e07c0b..e993a20 100644
--- a/.gitignore
+++ b/.gitignore
@@ -149,3 +149,5 @@ pyproject-sha.toml
 #version ignore
 grid_apps/_version.py
 /_version.json
+
+devtools/conda_env_pylint.bat
diff --git a/grid_apps/octree_creation/options.py b/grid_apps/octree_creation/options.py
index a3f27db..b568323 100644
--- a/grid_apps/octree_creation/options.py
+++ b/grid_apps/octree_creation/options.py
@@ -196,9 +196,12 @@ def collect_refinements_from_dict(data: dict) -> list[dict | None]:
         for param in ["object", "levels", "horizon", "distance"]:
             name = f"refinement_{param}" if param == "object" else param
             refinement_name = f"Refinement {identifier} {param}"
-            refinement_params[name] = data.get(refinement_name, None)
+            value = data.get(refinement_name, None)
 
-        if refinement_params["refinement_object"] is None:
+            if value is not None:
+                refinement_params[name] = value
+
+        if refinement_params.get("refinement_object", None) is None:
             refinements.append(None)
         else:
             refinements.append(refinement_params)
diff --git a/tests/run_tests/octree_creation/params_test.py b/tests/run_tests/octree_creation/params_test.py
index 3c473d6..37c0689 100644
--- a/tests/run_tests/octree_creation/params_test.py
+++ b/tests/run_tests/octree_creation/params_test.py
@@ -12,7 +12,7 @@
 from geoh5py import Workspace
 from geoh5py.groups import UIJsonGroup
 from geoh5py.objects import Points
-from geoh5py.ui_json import InputFile
+from geoh5py.ui_json import BaseUIJson, InputFile
 
 from grid_apps import assets_path
 from grid_apps.octree_creation.driver import OctreeDriver
@@ -139,3 +139,20 @@ def test_treemesh_from_params(tmp_path):
         assert mesh.u_cell_size == 25.0
         assert mesh.v_cell_size == 25.0
         assert mesh.w_cell_size == 25.0
+
+
+def test_params_from_uijson(tmp_path):
+
+    uijson = BaseUIJson.read(OctreeOptions.default_ui_json)
+
+    with Workspace.create(tmp_path / f"{__name__}.geoh5") as ws:
+        points = Points.create(ws, name="test", vertices=np.random.rand(100, 3))
+
+        kwargs = {
+            "geoh5": ws,
+            "objects": points,
+            "Refinement A object": points,
+        }
+        uijson.set_values(**kwargs)
+        params = OctreeOptions.build(**uijson.to_params(workspace=ws))
+        assert params.refinements is not None