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Fixed bug where clicking on type selection button the first time leads to error.

Author: chadefranklin

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs

@@ -81,7 +81,8 @@ TypePopupCache GetTypePopup (SerializedProperty property) {
 					m_TargetProperty.serializedObject.ApplyModifiedProperties();
 				};
 
-				m_TypePopups.Add(managedReferenceFieldTypename,new TypePopupCache(popup,state));
+				result = new TypePopupCache(popup, state);
+				m_TypePopups.Add(managedReferenceFieldTypename, result);
 			}
 			return result;
 		}