Imagine, I have put stop loss order for one crypto at $0.301, is it possible that if no one put a buy order at this price, my order will not be filled? I don't know how it works in such cases. Although the event is very unlikely to happen but, technically it's possible that no buyer put an order at $0.301
What will happen to my order?
Technically yes it won't execute especially in a scenario when there's a flash market crash. So let say the coins goes below your selling price with a fast rate that your sell price wasn't priced at the market e.g you set an order to sell at 10cents but there was no liquidity to execute that order then the price fell below 10cents to 8cents, it means your stop loss order is now a take profit order and can only be excuted if the price of that coins goes back up to 10cents or above.
What you just explained do happen in reality and has happened to me on severally occasions in my early days of trading although only when I'm trading aits. What happens is the rate at which the coins falls is so fast that it's miss your stop loss order. Which is why we're advice to not put our stop loss/sell limit too close to each other to avoid the market missing our order.