diff --git a/supervisor/addons/validate.py b/supervisor/addons/validate.py
index 03f2747bd..e022897b4 100644
--- a/supervisor/addons/validate.py
+++ b/supervisor/addons/validate.py
@@ -424,6 +424,11 @@ def _nested_validate_list(coresys, typ, data_list, key):
     """Validate nested items."""
     options = []
 
+    # Make sure it is a list
+    if not isinstance(data_list, list):
+        raise vol.Invalid(f"Invalid list for {key}")
+
+    # Process list
     for element in data_list:
         # Nested?
         if isinstance(typ, dict):
@@ -439,6 +444,11 @@ def _nested_validate_dict(coresys, typ, data_dict, key):
     """Validate nested items."""
     options = {}
 
+    # Make sure it is a dict
+    if not isinstance(data_dict, dict):
+        raise vol.Invalid(f"Invalid dict for {key}")
+
+    # Process dict
     for c_key, c_value in data_dict.items():
         # Ignore unknown options / remove from list
         if c_key not in typ:
diff --git a/tests/addons/test_options_schema.py b/tests/addons/test_options_schema.py
new file mode 100644
index 000000000..f44983adc
--- /dev/null
+++ b/tests/addons/test_options_schema.py
@@ -0,0 +1,65 @@
+"""Test add-ons schema to UI schema convertion."""
+
+import pytest
+import voluptuous as vol
+
+from supervisor.addons.validate import validate_options
+
+
+def test_simple_schema(coresys):
+    """Test with simple schema."""
+    assert validate_options(
+        coresys,
+        {"name": "str", "password": "password", "fires": "bool", "alias": "str?"},
+    )({"name": "Pascal", "password": "1234", "fires": True, "alias": "test"})
+
+    assert validate_options(
+        coresys,
+        {"name": "str", "password": "password", "fires": "bool", "alias": "str?"},
+    )({"name": "Pascal", "password": "1234", "fires": True})
+
+    with pytest.raises(vol.error.Invalid):
+        validate_options(
+            coresys,
+            {"name": "str", "password": "password", "fires": "bool", "alias": "str?"},
+        )({"name": "Pascal", "password": "1234", "fires": "hah"})
+
+    with pytest.raises(vol.error.Invalid):
+        validate_options(
+            coresys,
+            {"name": "str", "password": "password", "fires": "bool", "alias": "str?"},
+        )({"name": "Pascal", "fires": True})
+
+
+def test_complex_schema_list(coresys):
+    """Test with complex list schema."""
+    assert validate_options(
+        coresys, {"name": "str", "password": "password", "extend": ["str"]},
+    )({"name": "Pascal", "password": "1234", "extend": ["test", "blu"]})
+
+    with pytest.raises(vol.error.Invalid):
+        validate_options(
+            coresys, {"name": "str", "password": "password", "extend": ["str"]},
+        )({"name": "Pascal", "password": "1234", "extend": ["test", 1]})
+
+    with pytest.raises(vol.error.Invalid):
+        validate_options(
+            coresys, {"name": "str", "password": "password", "extend": ["str"]},
+        )({"name": "Pascal", "password": "1234", "extend": "test"})
+
+
+def test_complex_schema_dict(coresys):
+    """Test with complex dict schema."""
+    assert validate_options(
+        coresys, {"name": "str", "password": "password", "extend": {"test": "int"}},
+    )({"name": "Pascal", "password": "1234", "extend": {"test": 1}})
+
+    with pytest.raises(vol.error.Invalid):
+        validate_options(
+            coresys, {"name": "str", "password": "password", "extend": {"test": "int"}},
+        )({"name": "Pascal", "password": "1234", "extend": {"wrong": 1}})
+
+    with pytest.raises(vol.error.Invalid):
+        validate_options(
+            coresys, {"name": "str", "password": "password", "extend": ["str"]},
+        )({"name": "Pascal", "password": "1234", "extend": "test"})