The offence, which was committed while Mathieson was subject to a bail order, happened on July 23 last year.
And Mathieson also admitted a second charge of breaching a curfew bail condition.
Sheriff Philip Mann ordered sentence to be deferred on Mathieson, whose address was given in court papers as Mastrick Drive, Aberdeen, until July for him to be present.
He also for a criminal justice social work report and restriction of liberty order assessment to be prepared.
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Man admits breaking into Aberdeen house and stealing cash and keys