He vowed to give charity if the team he supports won the match

A person has vowed that if the team he supports won the match, he would give charity. What is the ruling?

Praise be to Allah, and blessings and peace be upon the Messenger of Allah:

Shaykh ‘Abd ar-Rahmaan al-Barraak was asked this question and he replied:

He is obliged to give charity, but this is blameworthy according to sharee‘ah for two reasons:

1.He connected his vow to a kind of idle pursuit that is blameworthy according to sharee‘ah

2.It is a conditional vow, and conditional vows are haraam or makrooh; they do not put back anything that Allah has decreed; rather all they do is get something out of the miser.