Save Actor Relative Rotation after On Component Begin Overlap and Timeline

Hi everyone!
I stuck with Save Game.
Algorythm is next - Player trigger the box, and actor’s component changing on Timeline its rotation from 90 to 0
In the next step player trigger Save Game Zone, and it must save current rotation, but when executing, Output Log shows an Access None error.
How to deal with that and save the component rotation?

Here is my Blueprints for understanding


What is the exact message? Is it complaining about SaveZone1 or Save1? If so, how do you Set value of those variables?