Liability to third persons for any act, omission, or obligation of a trustee or trustees of an express trust when acting in such capacity, shall extend to the whole of the trust estate held by such trustee or trustees, or so much thereof as may be necessary to discharge such liability, but no personal liability shall attach to the trustee or the beneficiaries of such trust for any such act, omission or liability.
Okla. Stat. tit. 60, § 174