Has this problem been solved? - I am getting the above error in a savegame, and it took me a while to find the offender, which seems to be ChoppedStraw:wwMinMaxAreas() calling getIsAreaActive() with an incomplete 'cuttingArea' object.
I added some debug-logging to ChoppedStraw.LUA, like so:
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and my LOG.TXT told me the following:
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Notice that 'cuttingArea' does not have the two required elements; foldMaxLimit and foldMinLimit, that the getIsAreaActive() function uses in its first if-statement.