Texas Property Code - PROP § 67.009. Waiver

(a) Except as provided by Subsection (b), an interest owner may not be required, as a condition or term of an agreement to sell or otherwise, to:

(b) An interest owner, or representative acting on behalf of an interest owner, may waive or release any oil and gas lien or any rights under this chapter or agree to apply the law of another state to the interest owner's oil and gas rights granted under this chapter, if the first purchaser:

(c) Unless waived or released under Subsection (b), a condition or term described by Subsection (a) is void.