The difference is very slight but they are both correct depending on your context.
Here is what Oxford's Lexico says:
An acquired or natural skill at doing something.
‘he had a knack *for* communicating’
A tendency to do something.
‘John had the enviable knack *of* falling asleep anywhere’
https://www.lexico.com/en/definition/knack
October 10, 2019
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