OSC Redundant argument in printf at /usr/bin/pt-online-schema-change line 3595.

Error copying rows from to : Redundant argument in printf at /usr/bin/pt-online-schema-change line 3595.

I am intermittently getting this error on some tables when running osc. The new target table is created, but after a few mins, before any progress line is displayed, this error appears during the copy data phase. I can’t find any commonality in the data of the tables that are having this problem. In testing, I’ve even tried setting all rows/columns to null, but the error still comes up.
I’m unable to find any more information on this error. Any ideas what is the root cause?

Thanks

This error has gone away for now. Might have been a dependency issue.