There is nothing wrong in
paying Zakah (obligatory charity) to those charged with an immediate debt when they cannot settle it. Thus, it is permissible to help and relieve them of it because they are included in Allah's Saying,
...and for those in debt
The man in question is in debt, because he is so poor that he cannot repay his debt.May Allah grant us all success. All peace be upon our Prophet Muhammad, his family and companions.