Crash in Alignment.glyphsPalette

[schriftgestalt]

Details:
Traceback (most recent call last):

 File "GlyphsApp/GlyphsApp/__init__.py", line 1099, in callback_

 File "~/Library/Application Support/Glyphs/Repositories/Alignment Palette/AlignmentPalette/Alignment.glyphsPalette/Contents/Resources/plugin.py", line 306, in update
   globalCenterX, globalCenterY = self.centerOfLayers( self.font.selectedLayers )

 File "~/Library/Application Support/Glyphs/Repositories/Alignment Palette/AlignmentPalette/Alignment.glyphsPalette/Contents/Resources/plugin.py", line 86, in centerOfLayers
   centerX, centerY = self.centerOfLayer( layer )

 File "~/Library/Application Support/Glyphs/Repositories/Alignment Palette/AlignmentPalette/Alignment.glyphsPalette/Contents/Resources/plugin.py", line 61, in centerOfLayer
   left = right = decomposedLayer.paths[0].nodes[0].x

AttributeError: 'NoneType' object has no attribute 'nodes'

App:2.6.9-1363 Plugin:1.17-1.17