Keep initial sidebearings: if checked doesn’t generate

[LaPolice]

RoboFont version: 4.5 (build 2410282152) - Monterey 12.7.6

Using Scale Fast 1.1, when “Keep initial sidebearings” is checked, the generating process is stalled and doesn't generate, whereas with the same files and settings (I use Presets) it does. Here's the traceback:

Traceback (most recent call last):
File "/Applications/RoboFont.app/Contents/Resources/lib/python3.12/vanilla/vanillaBase.py", line 539, in action_
self.callback(sender)
File "scaleFast.py", line 535, in _generationCallback
File "scaleFast.py", line 730, in generateGlyphsToFont
File "scaleFast.py", line 760, in buildScaledGlyphs
File "scaleFast.py", line 790, in retrieveScaledGlyph
File "lib/fontObjects/fontPartsWrappers.pyc", line 1904, in getitem
KeyError: "No glyph named '.notdef'."
Traceback (most recent call last):
File "lib/doodleDelegate.pyc", line 90, in sendEvent
File "/Applications/RoboFont.app/Contents/Resources/lib/python3.12/vanilla/vanillaBase.py", line 539, in action
self.callback(sender)
File "scaleFast.py", line 535, in _generationCallback
File "scaleFast.py", line 730, in generateGlyphsToFont
File "scaleFast.py", line 760, in _buildScaledGlyphs
File "scaleFast.py", line 790, in _retrieveScaledGlyph
File "lib/fontObjects/fontPartsWrappers.pyc", line 1904, in getitem
KeyError: "No glyph named '.notdef'."