ERROR: Uninitialized extra hints list in file -?

I uploaded a new font to one of my resellers. It came back with an error: ‘ERROR: Uninitialized extra hints list in file’. All of my other fonts are fine, but this one seems to have an issue that I have no idea what to do with. I didn’t do anything out of the ordinary, so I have no idea what this error message is about or how to solve it.

Any suggestions highly appreciated.

Can you ask them to be more specific what that error means?

I asked, but they said that they had no idea. I removed all hinting and it worked.

Could you send me one of the files that caused the error?