保证人知道或者应当知道主合同无效不能表明保证人有过错。
It is not the evidence of his fault that guarantor knew or should know that chief contract is invalid.
被保证的当事人不履行合同的，按照担保约定由保证人履行或者承担连带责任。
Where the guaranteed party fails to perform the contract, the guarantor shall perform or be held with joint obligation in accordance with the agreement on the guaranty.
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