Bug What is this big error I'm getting?

Unity 2021.3.19f1

Hello guys. I really have no idea what is this, can someone help me with that please?

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. UnityEditor.Graphs.Edge.WakeUp () (at <7f4fd65f7fa04406a223a05659029fd6>:0)
3. UnityEditor.Graphs.Graph.DoWakeUpEdges (System.Collections.Generic.List`1[T] inEdges, System.Collections.Generic.List`1[T] ok, System.Collections.Generic.List`1[T] error, System.Boolean inEdgesUsedToBeValid) (at <7f4fd65f7fa04406a223a05659029fd6>:0)
4. UnityEditor.Graphs.Graph.WakeUpEdges (System.Boolean clearSlotEdges) (at <7f4fd65f7fa04406a223a05659029fd6>:0)
5. UnityEditor.Graphs.Graph.WakeUp (System.Boolean force) (at <7f4fd65f7fa04406a223a05659029fd6>:0)
6. UnityEditor.Graphs.Graph.WakeUp () (at <7f4fd65f7fa04406a223a05659029fd6>:0)
7. UnityEditor.Graphs.Graph.OnEnable () (at <7f4fd65f7fa04406a223a05659029fd6>:0)

Yes need reopen this post after ~8 years passed, from 2015! https://forum.unity.com/threads/what-is-this-big-error-im-getting.324597/

 

The same answer from 2015 applies:
https://forum.unity.com/threads/what-is-this-big-error-im-getting.324597/#post-2105130

 

Same as the one yesterday and in 2021 too.

https://forum.unity.com/threads/how-do-i-fix-unityeditor-graphs.1086422/

 

without restart?

I need to understand how to avoid this, and not restart every time
https://forum.unity.com/threads/what-is-this-big-error-im-getting.324597/#post-6819101

 

There isn't really any avoiding it other than:
- Using a version of Unity that doesn't have the error (good luck)
- Getting Unity to fix it by reporting the bug(s)
- Not using the features of Unity that exhibit the bug.

 

Wow