I got this crash when deleting an induction matrix code in editor mode. The factory was nearly running out of power (if that's relevant).

I reloaded the autosave and couldn't reproduce it for about a minute or two - I kept adding and deleting the core - and then it crashed again. I've kept the save if you want it.

The mod Exotic Industries (0.5.9) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event exotic-industries::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__exotic-industries/scripts/control/induction_matrix.lua:1101: in function 'get_matrix_current_stored_power'
exotic-industries/scripts/control/induction_matrix.lua:1631: in function 'update_gui'
exotic-industries/scripts/control/induction_matrix.lua:1611: in function 'update_player_guis'
exotic-industries/scripts/control/induction_matrix.lua:1438: in function 'update'
exotic-industries/control.lua:275: in function 'updater'
exotic-industries/control.lua:91: in function <exotic-industries/control.lua:90>