What are implications of a creature cloning itself?

https://www.nytimes.com/2018/02/05/s...es-europe.html

Quote:

This Mutant Crayfish Clones Itself, and It’s Taking Over Europe

If a creature like the crayfish clones itself doesn't this make it susceptible to disease?

Just wondering what is the biological pros and cons of this?

via International Skeptics Forum http://ift.tt/2BOxEUO