Hi, I found this schall mod that I'm using conflicting with your spidertron engineer mod, do you mind looking through a bit? Thank you!

Error while running event SchallPerpetualMachine::on_configuration_changed
The mod Spidertron Engineer (1.8.7) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event SpidertronEngineer::on_technology_effects_reset (ID 100)
SpidertronEngineer/utils/table-utils.lua:26: attempt to index local 'entity' (a nil value)
stack traceback:
SpidertronEngineer/utils/table-utils.lua:26: in function 'remove_from_inventory'
SpidertronEngineer/control.lua:769: in function <SpidertronEngineer/control.lua:766>
stack traceback:
[C]: in function 'reset_technology_effects'
SchallPerpetualMachine/control.lua:3: in function 'reset_tech_effects'
SchallPerpetualMachine/control.lua:9: in function <SchallPerpetualMachine/control.lua:8>

Thanks for posting, it is now fixed in 1.8.8.

Thank you so much for the fix, it's working for me!