Except as otherwise provided in section 43-1241, a court of this state may not modify a child custody determination made by a court of another state unless a court of this state has jurisdiction to make an initial determination under subdivision (a)(1) or (a)(2) of section 43-1238 and:

(1) the court of the other state determines it no longer has exclusive, continuing jurisdiction under section 43-1239 or that a court of this state would be a more convenient forum under section 43-1244; or

(2) a court of this state or a court of the other state determines that the child, the child's parents, and any person acting as a parent do not presently reside in the other state.