A trustee can also be a beneficiary, however they cannot be the sole trustee and beneficiary, for then they would already hold legal and equitable title, meaning there is no need for the trust to exist at all.
It is suggested that a trust nominates more than one individual trustee anyway, which would mitigate against a situation where a trustee passes away or becomes unable to carry out their trustee duties.
This information is of a general nature only and does not constitute professional advice. You must seek professional advice in relation to your particular circumstances before acting.
Updated — Jul 7, 2017