Prevent right-click to follow units?

[hamiltonbb2]

I have a map I'm working on where accidentally right-clicking on another player's unit could easily lead to death. Is there a way to prevent being able to right-click on another player's units altogether? I've seen this done, for example, in maps like Run Kitty Run. I'm just not sure how they went about accomplishing it.

 

[sunshinex3]

• Untitled Trigger 001
  • Events
    • Unit - A unit Is issued an order targeting an object
  • Conditions
    • (Issued order) Equal to (Order(follow))
  • Actions
    • Unit - Order (Target unit of issued order) to Stop.

maybe i dont know i didnt test it... maybe thats not the right condition