[boink]

From experience, if you set a players model to an empty model, eg. SetEntityModel(i, ""), the server will crash when they die.

I had this issue for a loooonggg time before figuring out why, however I was only setting players' models to other player skins so it's possible you are not setting an invalid model and it might be an issue with the model itself?

I would assign dust_models[gen_random_number()] to a variable then check to make sure it's not empty before setting their model.