Sure, is very advisable for those that are interested to go into bitcoin investment to set emergency fund aside, this should be the first thing you will consider as a new investor. Else you will end up selling your holdings whenever emergency issues pop up, because bitcoin investment is not like other investment that you can do without setting an emergency fund aside. But in bitcoin investment is very compulsory, because the profit does not come within a short term rather it takes some couple of years before one can actually get profited. This is why having a backup is considered very important when  accumulating bitcoin, so that it will enable you leave your bitcoin untouched until when you get to the status of overaccumulation. And failure to do this will lead you into selling your bitcoin at lost just as @SoKo DEKE did and of course you wouldn't have experienced that if emergency fund was in place, I guess you weren't told about setting an emergency fund then. because had been you're aware of setting up an emergency, definitely this wouldn't have happened, or maybe the person that introduced you to bitcoin investment didn't inform you about having a backup......... This is why sometimes is good to make research when you're introduce into something because the person may not be able to explain everything to you, but when you make intensive research you can be able to figure out some things.