The mod Shield Generators (0.1.5) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event shield-generators::on_entity_destroyed (ID 156)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__shield-generators/control.lua:1375: in function 'on_destroyed'
shield-generators/control.lua:1501: in function <shield-generators/control.lua:1499>
Got this error while testing with Editor extensions. I was testing the Antimater bomb (fired from K2 Heavy rocket launcher) from Realistic Fusion Power with K2+SE and True nukes. Note if you do this test it well freeze the game for a while.
Edit it appears the problem is with the Editor extensions buildings.