Input error when trying to print part tags

When trying to print part tags from the non-conformance window it pops up a window with the error and will only print a blank tag.

Works fine on other non-conformances created the exact same way. I've pasted a copy of the error below:

Any ideas?

Error Detail
Input string was not in a correct format.

Stack Trace
at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at System.Convert.ToInt32(String value)
at Epicor.Mfg.UI.Rpt.MtlTags.Transaction.setIncomingParamsFromNonConfEntry(String[] parameters)
at Epicor.Mfg.UI.Rpt.MtlTags.MtlTagsForm.OnFormLoaded()
at Epicor.Mfg.UI.FrameWork.EpiBaseForm.formLoaded()