Mighty Morphin Morphology

This is my error:

Traceback (most recent call last):
File "C:\Users\USER\Documents\Anki\addons\morphman.py", line 6, in onMorphManRecalc
morph.main.main()
File "C:\Users\USER\Documents\Anki\addons\morph\main.py", line 199, in main
allDb = mkAllDb( cur )
File "C:\Users\USER\Documents\Anki\addons\morph\main.py", line 47, in mkAllDb
fieldValue = getMecabField( fieldName, flds, mid )
File "C:\Users\USER\Documents\Anki\addons\morph\main.py", line 17, in getMecabField
return stripHTML( splitFields( flds )[ idx ] )
TypeError: list indices must be integers, not NoneType

Anyone know what I'm doing wrong?