The mod YARM - Resource Monitor caused a non-recoverable error.
Please report this error to the mod author.
Error while running event YARM::on_tick (ID 0)
__YARM__/resmon.lua:473: attempt to index local 'entity_prototype' (a nil value)
stack traceback:
__YARM__/resmon.lua:473: in function 'update_chart_tag'
__YARM__/resmon.lua:607: in function 'finish_deposit_count'
__YARM__/resmon.lua:555: in function 'tick_deposit_count'
__YARM__/resmon.lua:536: in function 'count_deposits'
__YARM__/resmon.lua:1216: in function 'update_forces'
__YARM__/resmon.lua:1238: in function 'on_tick_internal'
__YARM__/resmon.lua:1271: in function <__YARM__/resmon.lua:1266>
I think I see what happened: an ore type disappeared or was renamed (possibly just an internal name change with no obvious signs). In this case, we should really think about discarding the site or something...
Reported on the mod portal at https://mods.factorio.com/mod/YARM/discussion/5cbc4cf55862c4000b547352: