I had a bug report for my mod that was basically that the productivity module .limiation was nil when I tried to add some items to it. After some suggestions the player found out that it was bobmodules that was causing the issue.
Line 46 of data.lua has the following
module.limitation = productivitymodulelimitation()
and from what I can tell "productivitymodulelimitation" doesn't exist, so it's just setting the limitation to nil.
