Assuming that that particular creditor was listed in your bankruptcy petitions, they could sue but they would not be able to obtain a judgment. As a matter of fact, you would be able to sue them for violating what’s call the “discharge stay.” There’s an injunction put in place for your previous creditors. Now, if you reaffirmed a debt with that creditor and then defaulted on that debt, then yes, that creditor can turn around and sue, or if you obtained a new creditor after your bankruptcy was filed, then that creditor could sue you as well.