*Reproducible on:*
* Bolt version: 1.4.14
* Unity version: 2018.4.30f1, 2019.4.17f1, 2020.1.17f1, 2020.2.1f1, 2021.1.0b1
* Platforms: Windows 10, macOS Catalina and most probably it will occur on Ubuntu as well

*Steps to reproduce:*
# Before creating a new project make sure that the Graph window is closed (not docked or floating)
# Create a new project
# Install the Bolt Asset (Instruction: https://docs.unity3d.com/2019.3/Documentation/Manual/bolt-installation.html)
# Open Window > Graph
# Click on the three dots located in the upper right corner of the Graph window
# Select 'Show Data...'

*Actual result:*
* The NullReferenceException gets thrown in the Console

{code:java}
NullReferenceException: Object reference not set to an instance of an object
Ludiq.SerializationData.ToString (System.String title) (at Ludiq.Core.Runtime/Serialization/SerializationData.cs:67)
Ludiq.SerializationData.ShowString (System.String title) (at Ludiq.Core.Runtime/Serialization/SerializationData.cs:110)
Ludiq.LudiqEditorWindow.<AddItemsToMenu>b__11_0 () (at Ludiq.Core.Editor/Windows/LudiqEditorWindow.cs:90)
UnityEditor.GenericMenu.CatchMenu (System.Object userData, System.String[] options, System.Int32 selected) (at <c5b8ea301f1f41bf85e0302c2ee96b92>:0)
{code}

*Expected result:*
* No errors should appear in the console.
* A text document should open with all the data requested.

*Notes:*
* The issue does not reproduce if the Graph window is already open when reopening the project (i.e. the Graph window was not closed before closing the project)