Courts will still generally enforce prenuptial agreements even if one party later decides that the terms of the agreement are unfair to him or her. Courts will usually only invalidate or void a prenuptial agreement if it is proven that the agreement was procured through undue influence, duress, or fraud by one party on the other. For example, the court may find that fraud occurred during the formation of a prenuptial agreement if one party concealed material financial information from the other party.