Stock Markets are entirely different,there are many many reasons for it collapse,but in case of crypto currencies,they fall if the price of bitcoin falls,or if some stock market bull wants to play with the markets and predicts something about bitcoin which ultimately leads to ,market crash,less demand of crypto is also a valid reason.
Stock markets crash way more than cryptos and bulls and bears immediately try to make the market stable. Cryptos man,you can trade and carefully and earn so damn much,stocks is like eh for me. Not attractive for me.
There is no relation B/w stocks and cryptos and they don't influence the other. So nothing much is there to worry.