Quickly looked that up, and the history is:
1842- US Supreme Court says free states do not have to voluntarily return slaves.
1850- Congress responds by passing a new statute, the Fugitive Slave Act, overruling the Court's 1842 ruling. Congress could do this because the Court wasn't saying that the Constitution mandated what it said, merely that there was no requirement either way under existing law.
1854- Wisconsin Supreme Court rules Fugitive Slave Act to be unconstitutional.
1859- US Supreme Court overrules Wisconsin Supreme Court, says that FSA is constitutional.
There's no nullification in this course of events, which would be the executive branch opening ignoring the law.
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