A Peace Action Wellington protester has escaped a trespassing conviction following a protest at Defence House.

Laura Drew was part of a group of protesters who took a cardboard cutout boat into Defence House to oppose a US naval ship visiting and increased military spending.

She was arrested during the protest last April and faced a judge-alone trial at the Wellington District Court today.

Judge Peter Butler said there were two technical issues in the prosecution case.

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He said the de minimis principle applies and discharged her without a conviction.

Drew wore a shirt with "I went to court and all I got was oppressed by the state again...." written on the back throughout the trial today.