Shawn has it. I've used leather straps on nitro guitars for 48 years, many brands (leave me alone, I'm OLD). Never ever had a problem.
If you're a guy who has to keep the strap hanging on the guitar forever, remember, too, that some plastic straps will also cause problems as the chemicals leech out of the plastic, and that most nylon straps have leather tabs at the ends for the strap buttons, and those will come into contact with the guitar, too.
So it's just wisest to remove the straps when you're done playing with nitro guitars.