diff --git a/Scripts/Editor/NodeEditorGUILayout.cs b/Scripts/Editor/NodeEditorGUILayout.cs
index 76bef8b..aea5a51 100644
--- a/Scripts/Editor/NodeEditorGUILayout.cs
+++ b/Scripts/Editor/NodeEditorGUILayout.cs
@@ -9,7 +9,8 @@ using UnityEngine;
 /// <summary> UNEC-specific version of <see cref="EditorGUILayout"/> </summary>
 public static class NodeEditorGUILayout  {
 
-    public static void PropertyField(SerializedProperty property, bool includeChildren) {
+    public static void PropertyField(SerializedProperty property, bool includeChildren = true) {
+        if (property == null) throw new NullReferenceException();
         Node node = property.serializedObject.targetObject as Node;
         NodePort port = node.GetPortByFieldName(property.name);