();
for (int i = 0; i < _blockTypes.Count; i++)
{
options.Add(_blockTypes*.Script.name);*
```
_}_
_int \_selectedBlockType = 0;_
_if (property.objectReferenceValue != null)_
_{_
_for (int i = 0; i \< \_blockTypes.Count; i++)_
_{_
_if (property.objectReferenceValue.GetType().ToString().Equals(options\*))\*_
_{_
_\_selectedBlockType = i;_
_}_
_}_
_}_
_int newSelection = EditorGUI.Popup(position, “Block Type”, \_selectedBlockType, options.ToArray());_
_if (\_selectedBlockType != newSelection && newSelection != 0)_
_{_
_System.Type blockType = \_blockTypes[newSelection].Script.GetClass(); //Working OK_
_ConstructorInfo constructor = blockType.GetConstructor(System.Type.EmptyTypes);_
_Object new\_block = (Object) constructor.Invoke(null); //Creates Object Without Issue_
_property.objectReferenceValue = new\_block; //Despite the Object | new Object | new ScriptableObject | new GameObject not being null. The property.objectReferenceValue always becomes null!_
_}_
_position = new Rect(position.x, position.y + EditorGUIUtility.singleLineHeight, position.width, EditorGUIUtility.singleLineHeight);_
_EditorGUI.PropertyField(position, property);_
_}_
_EditorGUILayout.EndVertical();_
_}_
_else_
_{_
_EditorGUI.PropertyField(position, property);_
_}_
_}_
_Does anyone have any idea why setting the serialized property makes it become null?_
---
### Author:  [@Bunny83](https://discussions.unity.com/u/Bunny83)
#### Post date: [April 15, 2020, 12:45am UTC](https://discussions.unity.com/t/help-with-serializedproperty-objectreferencevalue/233724/2 "2020-04-15T00:45:51Z")
You use reflection to manually invoke the constructor of your class. However scriptable objects can not be created with “new” since they are wrapper objects for native C++ objects like all classes derived from UnityEngine.Object. If you want to create an instance of a ScriptableObject you have to use [ScriptableObject.CreateInstance](https://docs.unity3d.com/ScriptReference/ScriptableObject.CreateInstance.html).
Apart from that keep in mind that scriptable objects are standalone assets. You can create them in memory but if you want them to persist you have to actually create an asset and store it in your project using the AssetDatabase. Creating them in memory and trying to store a reference to such an instance on disk won’t work. That reference will be lost since the object you try to reference is not serialized at all.
---
### Author:  [@Racaoma](https://discussions.unity.com/u/Racaoma)
#### Post date: [April 15, 2020, 3:27am UTC](https://discussions.unity.com/t/help-with-serializedproperty-objectreferencevalue/233724/3 "2020-04-15T03:27:08Z")
Hi @Bunny83. Curiously I’m using your Logic Parser on this project. It is working wonders!
I’ve tried using the ScriptableObject.CreateInstance, but again when I try to set the property it becomes null. If I understand correctly, the problem is that I’m trying to assign the property with an asset I created on memory?
---
### Author:  [@Racaoma](https://discussions.unity.com/u/Racaoma)
#### Post date: [April 15, 2020, 6:09pm UTC](https://discussions.unity.com/t/help-with-serializedproperty-objectreferencevalue/233724/4 "2020-04-15T18:09:28Z")
Indeed the issue was that the objects being assigned to the property were memory only. I changed the code to use temporary files that are saved to the disc and now everything is working fine.
```
System.Type blockType = _blockTypes[newSelection].GetClass();
ScriptableObject temporaryObject = ScriptableObject.CreateInstance(blockType);
AssetDatabase.CreateAsset(temporaryObject, pathToTemporaryFile);
serializedProperty.objectReferenceValue = temporaryObject;
```