Neb. Rev. Stat. § 77-1859
Whenever, for any reason, real estate has been sold or shall hereafter be sold for the payment of any tax or special assessment levied by any county, municipality, drainage district, or other political subdivision of the state, and it shall thereafter be determined by a court of competent jurisdiction that said sale was void, it shall be the duty of said county, municipality, drainage district, or other political subdivision of the state, which levied the tax or special assessment, to hold said purchaser harmless by paying him or her the amount of principal paid by him or her at the sale, with interest thereon at the rate specified in section 45-104.01, as such rate may from time to time be adjusted by the Legislature, from the date of sale.
Neb. Rev. Stat. § 77-1859