What is the ruling on a woman’s marriage without a walī?
[The marriage] is null just as the Prophet ﷺ said, “Whenever a woman marries without a walį (guardian), her marriage is null, null, null.” There must be a walī.
Are there conditions for the marriage contract?
Yes, the first condition of a marriage is the walī, the second is contentment of both spouses, and thirdly is attestation. There is no marriage except with a walī (guardian) and two upright witnesses.