Selling options (naked) is always highly risky.
It's a common practice to sell options (puts) in a perceived "up-market" believing prices will only go higher and the puts' strikes will never be reached... so the seller can keep all of the premium. That's all fine and good until the market/issue drops sharply enough that it traps all the sellers with large and sometimes VERY LARGE losses.
For the most part, selling naked options is like trying to pick up dimes in front of a steam roller.
If you've shorted a stock, then wrote a put against it... your profit potential is the difference between your sale price and the strike if the stock goes down. Not much profit potential. Loss potential, however, is unlimited... offset by the premium you collected for the put your wrote (which expires at zero) if the stock goes higher.