Gambling is an illegal and criminal act. Gambling debts are not protected by law. If you know that the other party is gambling, you still lend money to the other party. This lending relationship is also not protected by law.
Article 58 of the General Principles of the Civil Law The following civil acts are invalid:
(1) It is committed by a person without capacity for civil conduct;
(2) A person with limited capacity for civil conduct cannot independently implement it according to law;
(3) One party makes the other party act against its true meaning by means of fraud, coercion or taking advantage of others' danger;
(4) Malicious collusion that harms the interests of the state, the collective or a third party;
(5) Violating laws or public interests;
(six) the economic contract violates the mandatory plan of the state;
(seven) to cover up illegal purposes in a legal form.
An invalid civil act is not legally binding from the beginning.