Yes, the error was caused by the line checking the tag name of the hotspot. Sorry I forgot to mention it. The Null-cheking addition solved the issue.
I feel a bit stupid now because I tried using a null check but I used it on the tag instead which …
Thanks Chris! That did the trick.
One small correction in case anyone else wants to use this.
I was getting a namespace not found in line : "if (dragBase is PickUp)"
I changed "PickUp" to "Moveable_PickUp" and it works…