Error in Glyphs 2.5 (1131)

[uebele]

Traceback (most recent call last):
File "/Users/ludwiguebele/Library/Application Support/Glyphs/Plugins/Waterfall.glyphsPlugin/Contents/Resources/plugin.py", line 132, in drawRect_
self.drawText(str(s), self.wrapper.foreColour, 10, h-s-sSum-2)
File "/Users/ludwiguebele/Library/Application Support/Glyphs/Plugins/Waterfall.glyphsPlugin/Contents/Resources/plugin.py", line 148, in drawText
String.drawAtPoint((x, y))
ValueError: NSInvalidArgumentException - -[NSNull set]: unrecognized selector sent to instance 0x7fff9204f0e0