Auckland Council says its mistake in calculating rates owed by activist Penny Bright was a one-off, and does not indicate a wider issue.
The council's chief financial officer Kevin Ramsay said its error did not change the fact that Ms Bright "owes thousands of dollars in unpaid rates bills".
"A number of options remain open to Ms Bright to settle this without further need for court action and delay," he said.
Yesterday, a judgment allowing the forced sale of Ms Bright's Kingsland home to pay the debt was set aside in Auckland District Court after errors in the council's calculation was highlighted.
"The errors the court referred to relate almost entirely to the incorrect inclusion in Ms Bright's rates bill of previous orders of court costs against her which remain unpaid but were separate from the rates owing," Mr Ramsay said.