PKHeX exception in DPP Underground Editor

[autofire372]

The following exception occurred in the DataGridView:

System.ArgumentException:
DataGridViewComboBoxCell value is not valid.

To replace this default dialog please handle the DataError event.

This message pops up when attempting to change tabs in the Underground Editor. It comes pretty close to spin-locking PKHeX, as it pops up again immediately after it is closed, ad infinitum. Hammering the OK button is needed to escape the error loop.

Tested on Windows 10.

[Kaphotics]

Thanks, fixed on latest commit.

https://github.com/kwsch/PKHeX/commit/c591e9b809bda02a46827b023502bf19526d858e