[BUG] Graph Editor ArgumentNullException after upgrading to 3.18

[kiamvddParticipant]

We were previously on 2.94, and decided to upgrade since we ran into a bug with object references on the blackboard. The transition went relatively smoothly, but now we’ve run into an editor issue where the graph editor will start throwing errors if you switch scenes while editing the behavior tree of an object in the previously active scene.

How to reproduce:

• Create two scenes
• Place an object in one scene with a behavior tree on it
• Open the graph editor by clicking “EDIT BEHAVIOR TREE” on the behavior tree owner
• Switch to the other scene
• Errors should now pop up in the console (see screenshot)

Tested in 2019.4.20 as well as 2020.2. Reproducible both in our active project as well as in a completely fresh project (with a clean install of NodeCanvas).

[GavalakisKeymaster]

Hello there,

This is indeed an issue that has though been fixed, but not yet live. I am attaching for you here the fixed files for your convenience.

Please let me know if the issue goes away after you import the attached package.

Thank you!

[Author]

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