To terminate a contract due to an error, both parties must have made an error with respect to a basic assumption on which the contract was based, the error must have a significant impact on the agreed exchange and relate to facts that existed at the time of the conclusion of the contract. In addition, the party who wishes to evade the contract must not have contractually assumed the risk of error. Whether you are creating a contract or a contract, you can rely on the agreement by following these tips: Invalid contracts can occur if one of the parties involved is not able to fully understand the effects of the agreement. For example, a person with a mental disability or an intoxicated person may not be consistent enough to adequately grasp the parameters of the agreement, making it invalid. In addition, agreements concluded by minors may be considered null and void; However, some contracts with minors who obtain consent from a parent or guardian may be enforceable.