(1) Conditional obligation void - Where the potestative condition depends solely upon the will of the debtor, the conditional obligation shall be void because its validity and compliance is left to the will of the debtor (Art. 1308) and it cannot, therefore, be easily demanded. In order not to be liable, the debtor will just not fulfill the condition. There is no burden on the debtor and consequently, no juridical tie is created. (Art. 1156)