The court at any stage of a proceeding under this chapter, on application of a party or on motion of the court, shall appoint a guardian ad litem for a child who is a party to the proceeding if the child has no parent, guardian, or custodian appearing on the child’s behalf or the interests of the parent, guardian, or custodian conflict with the child’s or in any other case in which the interests of the child require a guardian. A party to the proceeding or that party’s employee or representative may not be appointed. A guardian ad litem appointed under this section is immune from civil liability for damages for any act or omission arising out of that individual‘s duties and responsibilities as a guardian ad litem, unless the act or omission constitutes gross or willful negligence or gross or willful misconduct.