If an investor cannot keep an emergency fund or a reserve fund (backup fund), then he will put his investment at risk. Because an emergency fund is kept for danger. If an investor gets into danger while running his investment and there is no one to help him. Then if he has to sell the investment to get rid of that danger, then he will have no end of regrets. You can face many obstacles and dangers while investing. Therefore, an emergency fund or a reserve fund is necessary to deal with any emergency situation.
Danger never comes in a hurry. If you keep an emergency fund, it means that you are going to invest risk-free. Those who do not keep an emergency fund or a reserve fund often lose their investment after being caught in a storm.