When trying to deconstruct the air purifier either by hand or by using robots the game crashes and this is the error (using SE and K2 playthrough):

Error while running event better-ecology::on_player_mined_entity (ID 67)
better-ecology/control.lua:98: bad argument #1 of 2 to 'ipairs' (table expected, got nil)
stack traceback:
[C]: in function 'ipairs'
better-ecology/control.lua:98: in function 'unregisterModEntity'
better-ecology/control.lua:115: in function <better-ecology/control.lua:114>

Hope I fixed that bug. Please update to 0.0.7.
Thank you for your report ^_^

Yep, works like a charm now, thank you!