FrameDraw.cs can get called with nulls

If you pin and unpin stuff a lot eventually one of the values getting passed to FrameDraw.cs is null

You can either fix it. or add scaffolding to prevent the error propagating
Currently I am just telling people to add this
https://media.discordapp.net/attachments/445594393848709122/908839455463440414/unknown.png?width=1191&height=631

Hope it helps.