diff --git a/tests/trestle/tasks/csv_to_oscal_cd_test.py b/tests/trestle/tasks/csv_to_oscal_cd_test.py
index 78a264a13..48c9da994 100644
--- a/tests/trestle/tasks/csv_to_oscal_cd_test.py
+++ b/tests/trestle/tasks/csv_to_oscal_cd_test.py
@@ -1138,3 +1138,69 @@ def test_execute_validation(tmp_path: pathlib.Path) -> None:
     assert component.props[2].name == 'Check_Description'
     assert component.props[2].value == 'validation-check-description'
     assert len(component.control_implementations) == 0
+
+
+def test_row_property_builder(tmp_path):
+    """Test row property builder."""
+    # valid
+    prop = csv_to_oscal_cd.row_property_builder(
+        row=0,
+        name='name',
+        value='value',
+        ns='https://www.ibm.com',
+        class_='class',
+        remarks='remarks',
+    )
+    assert prop
+    # missing name
+    try:
+        prop = csv_to_oscal_cd.row_property_builder(
+            row=0,
+            name=None,
+            value='value',
+            ns='https://www.ibm.com',
+            class_='class',
+            remarks='remarks',
+        )
+        raise AssertionError('missing name OK?')
+    except Exception:
+        assert prop
+    # missing value
+    try:
+        prop = csv_to_oscal_cd.row_property_builder(
+            row=0,
+            name='name',
+            value=None,
+            ns='https://www.ibm.com',
+            class_='class',
+            remarks='remarks',
+        )
+        raise AssertionError('missing value OK?')
+    except Exception:
+        assert prop
+    # invalid ns
+    try:
+        prop = csv_to_oscal_cd.row_property_builder(
+            row=0,
+            name='name',
+            value='value',
+            ns='foobar',
+            class_='class',
+            remarks='remarks',
+        )
+        raise AssertionError('invalid ns OK?')
+    except Exception:
+        assert prop
+    # invalid class
+    try:
+        prop = csv_to_oscal_cd.row_property_builder(
+            row=0,
+            name='name',
+            value='value',
+            ns='https://www.ibm.com',
+            class_='\n',
+            remarks='remarks',
+        )
+        raise AssertionError('invalid class OK?')
+    except Exception:
+        assert prop
diff --git a/trestle/tasks/csv_to_oscal_cd.py b/trestle/tasks/csv_to_oscal_cd.py
index 39a07ca7d..1a0a11c7f 100644
--- a/trestle/tasks/csv_to_oscal_cd.py
+++ b/trestle/tasks/csv_to_oscal_cd.py
@@ -82,6 +82,65 @@ def derive_part_id(control_mapping: str) -> str:
     return rval
 
 
+def etype(target: str) -> str:
+    """Get etype."""
+    if target:
+        return 'invalid'
+    else:
+        return 'missing'
+
+
+def row_property_builder(row: int, name: str, value, ns: str, class_: str, remarks: str) -> Property:
+    """Row property builder."""
+    # name
+    try:
+        Property(
+            name=name,
+            value='value',
+        )
+    except Exception:
+        text = f'property for row: {row} name: {name} is {etype(name)}'
+        raise RuntimeError(text)
+    # value
+    try:
+        Property(
+            name=name,
+            value=value,
+        )
+    except Exception:
+        text = f'property for row: {row} value: {value} is {etype(value)}'
+        raise RuntimeError(text)
+    # ns
+    try:
+        Property(
+            name=name,
+            value=value,
+            ns=ns,
+        )
+    except Exception:
+        text = f'property for row: {row} ns: {ns} is {etype(ns)}'
+        raise RuntimeError(text)
+    # class
+    try:
+        Property(
+            name=name,
+            value=value,
+            class_=class_,
+        )
+    except Exception:
+        text = f'property for row: {row} class: {class_} is {etype(class_)}'
+        raise RuntimeError(text)
+    # prop
+    prop = Property(
+        name=name,
+        value=value,
+        ns=ns,
+        class_=class_,
+        remarks=remarks,
+    )
+    return prop
+
+
 class CsvToOscalComponentDefinition(TaskBase):
     """
     Task to create OSCAL ComponentDefinition json.
@@ -911,18 +970,15 @@ def __init__(self, row_number: int, rule_set: str) -> None:
     def add_prop(self, name: str, value: str, ns: str, class_: str) -> None:
         """Add prop."""
         if value is not None and len(value):
-            try:
-                prop = Property(
-                    name=name,
-                    value=value,
-                    ns=ns,
-                    class_=class_,
-                    remarks=self._rule_set,
-                )
-                self._props[name] = prop
-            except Exception:
-                text = f'Invalid property name: {name} value: {value} remarks: {self._rule_set}'
-                raise RuntimeError(text)
+            prop = row_property_builder(
+                row=self._row_number,
+                name=name,
+                value=value,
+                ns=ns,
+                class_=class_,
+                remarks=self._rule_set,
+            )
+            self._props[name] = prop
 
     def get_props(self) -> List[Property]:
         """Get props."""
@@ -1438,8 +1494,6 @@ def __init__(self, csv_path: pathlib.Path) -> None:
         self._csv_controls_map = {}
         self._csv_profile_list = []
         for row_num, row in self.row_generator():
-            if self._is_no_control(row):
-                continue
             self._check_row_minimum_requirements(row_num, row)
             component_title = self.get_row_value(row, f'{COMPONENT_TITLE}')
             component_type = self.get_row_value(row, f'{COMPONENT_TYPE}')
@@ -1454,7 +1508,7 @@ def __init__(self, csv_path: pathlib.Path) -> None:
             logger.debug(f'csv-rules: {key} {self._csv_rules_map[key][0]}')
             # set parameters, by component
             source = self.get_row_value(row, PROFILE_SOURCE)
-            if source not in self._csv_profile_list:
+            if source and source not in self._csv_profile_list:
                 self._csv_profile_list.append(source)
             description = self.get_row_value(row, PROFILE_DESCRIPTION)
             param_id = self.get_row_value(row, PARAMETER_ID)
@@ -1489,6 +1543,8 @@ def row_generator(self) -> Generator[Union[int, Iterator[List[str]]], None, None
             index += 1
             if index < 3:
                 continue
+            if self._is_no_control(row):
+                continue
             logger.debug(f'row_gen: {index} {row}')
             yield index, row