'Accessed none from get streaming level error'

I’ve got this set up to load a loading widget whenever a streaming level is pending. However, when i run it i get lots of errors, ‘accessed none’, which i guess is because the streaming levels aren’t loaded yet. This error doesn’t seem to effect the gameplay in anyway, but i guess i should do something about it? How can I fix it?

Use a “IsValid” node and input the object into it which is giving accessed none error.