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This seems relevant:
Catholic Encyclopedia:
Catholic Encyclopedia:
Every substantial error, or indeed every error which is really the cause of making a vow, renders the vow null and void… One who can say sincerely, “if I had known this or that, I would not have made the vow”, is not bound by the vow… no vow must be made to God of any unlawful or indifferent matter. The reason is simple: God is all holy and cannot accept the offering of anything which is bad or less good in its nature… All obligation ceases when the fulfilment of the vow becomes impossible or harmful, or if the reason for the vow ceases to exist.