Mourners at a funeral in Germany got an involuntary high when they were accidentally served hash cake, police said Tuesday.

The funeral party went to a restaurant after the burial in Wiethagen for coffee and cake, a German tradition. After eating the cake, 13 people reported experiencing nausea and dizziness and needed medical treatment.

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The Rostock police said the person in charge of the cakes asker her 18-year-old daughter to bake them.

The mother mistakingly gave the wrong cake to the mourners. She instead took the hash cake, which was made for a separate occasion.

The teen is under investigation, the police said.

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Police said the incident happened in August but was not made public out of respect for the mourners.

The Associated Press contributed to this report.