An "At Risk Loss" would occur if you had a loss on the property and you were not "At Risk" up to the amount of the loss. To be at risk, it means that your basis in the properly is less than the losses the properly is generating.
You basis is basically what you invested in the rental activity, plus any income you reported on your tax return over the years, less losses that you deducted.
So, you would have to do a basis calculation to determine what your at risk loss is. It would be the amount of your basis, if it was negative.
Here is an article on how to calculate basis:
https://taxmap.irs.gov/taxmap2016/pubs/p541-006.htm
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