Raft Issue

[maca404]

Running sfact on linux mint works fine until i add a raft, setting both base layers and interface layers to 1 and I get the following:

Multiply procedure took 1 second.

Supports generated for overhangs flatter than: 36.8698976458

Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1413, in call
return self.func(*args)
File "/home/laptop/Desktop/SFACT-master/fabmetheus_utilities/settings.py", line 1173, in execute
self.repository.execute()
File "sfact.py", line 599, in execute
skeinforge_craft.writeOutput(fileName) #use this line instead of the below two for regular python slicing
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_utilities/skeinforge_craft.py", line 135, in writeOutput
return pluginModule.writeOutput(fileName, shouldAnalyze)
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/export.py", line 275, in writeOutput
gcodeText = skeinforge_craft.getChainTextFromProcedures(fileName, procedures[: -1], gcodeText)
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_utilities/skeinforge_craft.py", line 44, in getChainTextFromProcedures
text = craftModule.getCraftedText(fileName, text)
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/raft.py", line 226, in getCraftedText
return getCraftedTextFromText(archive.getTextIfEmpty(fileName, text), repository)
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/raft.py", line 236, in getCraftedTextFromText
return RaftSkein().getCraftedGcode(gcodeText, repository)
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/raft.py", line 815, in getCraftedGcode
self.addRaft()
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/raft.py", line 585, in addRaft
self.addBaseLayer()
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/raft.py", line 449, in addBaseLayer
self.addLayerFromEndpoints( self.baseEndpoints, self.repository.baseFeedRateMultiplier.value,self.repository.baseFlowRateMultiplier.value,baseLayerThickness,self.baseLayerThicknessOverLayerThickness, self.baseStep,z)
File "/home/laptop/Desktop/SFACT-master/skeinforge_application/skeinforge_plugins/craft_plugins/raft.py", line 512, in addLayerFromEndpoints
feedRateMinute = self.feedRateMinute * feedRateMultiplier / layerThicknessRatioSquared
TypeError: unsupported operand type(s) for *: 'NoneType' and 'float'

I have tried running as both root and regular user, If I reset the value's to zero it slices fine.

Any Ideas ?

Cheers