Thanks @Mind-Brain!
I’ve removed the extra Get AI Controller as, yes, it wasn’t really needed.
I’ve also done as you have suggested and pulled a print string straight out of the get blackboard to see if that returns anything.
As you can see from the output log it doesn’t pull through anything to the print screen from the get blackboard. It also doesn’t throw the “Accessed none trying to read property Blackboard” error either.
Just for piece of mind I created a new AI Controller, Behaviour Tree, and Blackboard and this still does not return any thing when attempting to get the display name.
I then tried to read the value of a blackboard key (i_check which has a default value of 999)
What is seen here is that it throws the “Accessed none trying to read property Blackboard” error but also returns 0 instead of 999 via the print string.