Impossibility
A performance owed cannot be rendered.
If a performance is impossible, for example because the purchased thing has been destroyed, the duty to perform ceases. Depending on responsibility, the other side may be released from the counter-performance or claim damages.
The relevant statutes
§ 275 BGB
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General explanation for self-help, not legal advice (RDG). Individual cases may differ: if in doubt, contact a consumer advice center or a lawyer.