Crash when generating with empty field name

[epistularum]

Error
An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
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Debug info:
Anki 23.10.1 (fac9e0ee) Python 3.11.6 Qt 6.6.0 PyQt 6.6.0
Platform: Linux-6.6.2-arch1-1-x86_64-with-glibc2.38
Flags: frz=False ao=True sv=3
Add-ons, last update check: 2023-11-22 21:24:37
Add-ons possibly involved: ⁨Kanji Grid 2310⁩

Caught exception:
Traceback (most recent call last):
  File "/home/arch/.local/share/Anki2/addons21/1469765093/__init__.py", line 457, in setup
    self.makegrid(config)
  File "/home/arch/.local/share/Anki2/addons21/1469765093/__init__.py", line 362, in makegrid
    self.displaygrid(config, units, timeNow)
  File "/home/arch/.local/share/Anki2/addons21/1469765093/__init__.py", line 280, in displaygrid
    self.generate(config, units, timeNow)
  File "/home/arch/.local/share/Anki2/addons21/1469765093/__init__.py", line 256, in generate
    self.html += "<h4 style=\"color:#888;\">%d of %d - %0.2f%%</h4>\n" % (n, gc, n*100.0/gc)
                                                                                 ~~~~~~~^~~
ZeroDivisionError: float division by zero