4443.269 Error MainLoop.cpp:1288: Exception at tick 13668610: The mod Exotic Industries (0.4.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event exotic-industries::on_built_entity (ID 6)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__exotic-industries/scripts/control/induction_matrix.lua:332: in function 'lookup_tile_for_entity'
exotic-industries/scripts/control/induction_matrix.lua:225: in function 'check_connected_tiles'
exotic-industries/scripts/control/induction_matrix.lua:1153: in function 'on_built_entity'
exotic-industries/control.lua:276: in function 'on_built_entity'
exotic-industries/control.lua:60: in function <exotic-industries/control.lua:59>

4443.269 Error MainLoop.cpp:1288: Exception at tick 13668610: The mod Exotic Industries (0.4.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event exotic-industries::on_built_entity (ID 6)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__exotic-industries/scripts/control/induction_matrix.lua:332: in function 'lookup_tile_for_entity'
exotic-industries/scripts/control/induction_matrix.lua:225: in function 'check_connected_tiles'
exotic-industries/scripts/control/induction_matrix.lua:1153: in function 'on_built_entity'
exotic-industries/control.lua:276: in function 'on_built_entity'
exotic-industries/control.lua:60: in function <exotic-industries/control.lua:59>

When did you get this crash?

I added and removed elements in an induction matrix (using blueprint sandbox)

This happened to me and my friend, I think the cause was me trying to slap down another core on the same platform. Haven't had it happen since, but I also haven't tried that again.