If you have healthy crickets in a good set up with proper ventilation and no subrate it shouldn't be that bad. If you have lots of dead ones every day, they probably aren't set up optimally. The rotting corpses combined with to much humidity can be pretty rancid and even likely accelerate the deaths feeding a cycle of nastiness. Its hard to say without knowing your set up, but ventilation is pretty important, especially if they are over crowded.
What I've done before is take a tote, and put egg flats in it, then something to hold food (grinded up dog food works), something to hold polymer crystals, and nothing else in there but crickets. Fruit/veg scraps are not necessary if you have crystals in there, and will only attract fruit flies, and raise humidity, and mold if you forget about them for to long. Then take the lid and cut a big square out of it. Really big, where most of the lid is gone except a few inches around the edges. It can be a good idea to leave a strip across the middle for extra support. Then hot glue window screen to that. Although its not quite as pretty looking, I glue the screen to the top of the lid, not inside. If you put it to the underside of the lid, and somehow half of it comes loose, the part that comes loose is going to fall in making a bridge for them to walk out and get loose. Taking a ruff sandpaper to the lid where your going to hot glue it doesn't hurt. Oh, and dont go overboard on the crystals because they create some humidity as well.
