Even if the contract does not have a legal person signature or legal person seal, it is still valid if it has a company seal. The official seal represents the company. The official seal should be controlled in a timely manner. If the actor exceeds his authority to sign a contract and causes losses to the company, he can recover compensation.

Contract Law: Article 50 If a legal representative or responsible person of a legal person or other organization enters into a contract beyond his authority, the representative act shall be valid unless the counterparty knows or should know that he has exceeded his authority.

Contract Law: Article 52 The legal circumstances under which a contract is invalid include any of the following circumstances:

(1) One party enters into a contract through fraud or coercion; Damaging national interests;

(2) Malicious collusion to harm the interests of the country, the collective or a third party;

(3) Covering illegal purposes in legal forms;

(4) Harm the interests of the public;

(5) Violate the mandatory provisions of laws and administrative regulations.