Can you spot the error?

oops, something's wrong

For those of you following along, these are some of the latest Gemma fonts. Five weights, three widths, Latin, Greek, Cyrillic, & dingbats: moving closer to completion every day.

But today something went wrong with the test fonts. Can you figure out what happened?

HINT: there was only a problem with one glyph in the master file.

First one to guess the bad glyph wins!