Negotiable Instruments Act Article 61

A guarantor shall assume the same liabilities as the person guaranteed.Even if the liabilities contracted by the person guaranteed are void, the guarantor shall remain liable for the obligations arising from the guaranty, provided that this provision shall not apply if the liabilities of the person guaranteed are void because of a defect in form.
中文原文 票據法第61條
保證人與被保證人負同一責任。
被保證人之債務縱為無效,保證人仍負擔其義務。
但被保證人之債務,因方式之欠缺而為無效者,不在此限。

English translation for reference only; the Chinese text prevails. Not legal advice.