emergency funds should not be invested. because we know that this emergency situation can happen anytime. we can not predict about this. if an emergency fund is invested in cryptocurrency and you need funds but the market price goes down, will you sell it directly.. 
When you make a plan make sure you have a backup plan also so that when the risk occurs such as a decrease in price or loss. you still have a backup plan you can use it. a backup plan can contain a backup of funds so your finances will remain stable and awake even if you suffer losses though