You were spot on! The keeper we were calling had no saves which is why it did not return data.
Thank you for your help!

Hi,
yes, of course, saves data are tracked by the API so you should be able to get that statistic for goalkeepers, only take in mind that data could be not shown for goalkeepers without a save, but this is true for any other statistic.
Let us know if you find out any problem.
Have a nice day.
bye