Question:
Answer:
Yes. For example, a person attempting marriage can make an invalid vow, although that would have to be determined by a Church tribunal. The Church addresses invalid consent regarding marriage vows in canon 1095 of the Code of Canon Law:
The following are incapable of contracting marriage:
1. those who lack the sufficient use of reason;
2. those who suffer from a grave defect of discretion of judgment concerning the essential matrimonial rights and duties mutually to be handed over and accepted;
3. those who are not able to assume the essential obligations of marriage for causes of a psychic nature.
The Church also has laws governing vows taken by men and women religious. Here is an index regarding vows in general in the Code of Canon Law.
If you have a specific case(s) of concern, whether regarding a married person or a person who has taken religious vows, contact your parish pastor, and he can refer you to the local diocesan marriage tribunal or help you connect with the relevant religious superior.