Do i need to worry about.....?

Hi all.

As part of my roll over /pop up menu function i’ve added 'stop’s to movieclips that aren’t always on the stage (basically to stop everything while the menu is on) and of course i get the old error “Cannot access a property or method of a null object reference”. I understand what its saying but my question is - do i need to worry about it when the function does what i want anyway??

Thanks for your thoughts and comments.