after last update can`t load save or start new game.

The mod Abandoned Ruins - Updated (1.5.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event AbandonedRuins_updated_fork::on_nth_tick(10)
AbandonedRuins_updated_fork/lua/spawning.lua:381: attempt to index global 'ruin' (a nil value)
stack traceback:
AbandonedRuins_updated_fork/lua/spawning.lua:381: in function 'clear_area'
AbandonedRuins_updated_fork/lua/spawning.lua:435: in function 'spawn_ruin'
AbandonedRuins_updated_fork/lua/spawning.lua:511: in function 'spawn_random_ruin'
AbandonedRuins_updated_fork/lua/events.lua:107: in function <AbandonedRuins_updated_fork/lua/events.lua:61>

The mod Abandoned Ruins - Base (0.1.7)
The mod Abandoned Ruins - Updated (1.5.1)
The mod Abandoned Ruins 2.0 - silly extention (0.3.0)
The modRealistic Ruins - Updated to 2.0 (0.1.3)

Thank you for reporting this!

1.5.2 will fix this issue, along with an other one, I have discovered during loading a ~5 months old save game.

new game and realistic ruins as standart

The mod Abandoned Ruins - Updated (1.5.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event AbandonedRuins_updated_fork::on_nth_tick(10)
AbandonedRuins_updated_fork/lua/utilities.lua:110: Parameter amount=0.00 cannot be zero or below
stack traceback:
[C]: in function 'error'
AbandonedRuins_updated_fork/lua/utilities.lua:110: in function 'safe_damage'
AbandonedRuins_updated_fork/lua/spawning.lua:215: in function 'spawn_entity'
AbandonedRuins_updated_fork/lua/spawning.lua:289: in function 'spawn_entities'
AbandonedRuins_updated_fork/lua/spawning.lua:444: in function 'spawn_ruin'
AbandonedRuins_updated_fork/lua/spawning.lua:509: in function 'spawn_random_ruin'
AbandonedRuins_updated_fork/lua/events.lua:107: in function <AbandonedRuins_updated_fork/lua/events.lua:61>

Gee, that was unexpected as it didn't happen here. :-( I moved to an unexplored area and ruins spawn without a crash. The error message Parameter amount=0.00 cannot be zero or below is intended as no damage dealt is just a waste of invoking the game's function LuaEntity.damage() which is documented here: https://lua-api.factorio.com/latest/classes/LuaEntity.html#damage which reads: "The amount of damage to be done." I have added extra_options.dmg > 0 to the code which should fix this (1.5.3!).