Delete _new table from pt-online-schema-change

I used pt-online-schema-change but the process died in the middle. The script makes a copy of the original table with the name followed by "_new". Since the process died in the middle, the table "_new" wasn't deleted and when I try to delete it my application crashes. It seems whenever I alter the original table this _new table is also changed so if it is not found it crashes. I would like to know how can I remove this _new table.