The mod Bulldozer Equipment (1.0.0)
Error while running event BulldozerEquipment::on_player_created (ID 30)
BulldozerEquipment/control.lua:296: attempt to index upvalue 'unit_number_to_equipped_entity' (a nil value)
stack traceback:
BulldozerEquipment/control.lua:296: in function 'refresh_whether_entity_is_equipped'
BulldozerEquipment/control.lua:948: in function <BulldozerEquipment/control.lua:931>

This is the second report I've received of this issue, but I don't know how to reproduce it; the first report is at https://github.com/smcpeak/factorio-bulldozer-equipment/issues/1 .

Could you provide a save game and/or log file? See the instructions on the linked github issue for the log file. You could add them here or on github.

same, im going to github

This should be fixed in version 1.0.1. Sorry for the long delay.