Deleting a surface with a marked ore patch crashes the game.
I assume the issue is that YARM doesn't check if the surface/planet is null/nil before trying to access it

Please report this error to the mod author.

Error while running event YARM::on_tick (ID 0)
Given surface does not exist anymore.
stack traceback:
[C]: in function 'add_chart_tag'
YARM/resmon.lua:515: in function 'update_chart_tag'
YARM/resmon.lua:682: in function 'finish_deposit_count'
YARM/resmon.lua:621: in function 'tick_deposit_count'
YARM/resmon.lua:602: in function 'count_deposits'
YARM/resmon.lua:1325: in function 'update_forces'
YARM/resmon.lua:1347: in function 'on_tick_internal'
YARM/resmon.lua:1380: in function <YARM/resmon.lua:1375>
7093.791 Error ClientMultiplayerManager.cpp:98: MultiplayerManager failed: "The mod YARM - Resource Monitor (0.8.204) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event YARM::on_tick (ID 0)
Given surface does not exist anymore.
stack traceback:
[C]: in function 'add_chart_tag'
YARM/resmon.lua:515: in function 'update_chart_tag'
YARM/resmon.lua:682: in function 'finish_deposit_count'
YARM/resmon.lua:621: in function 'tick_deposit_count'
YARM/resmon.lua:602: in function 'count_deposits'
YARM/resmon.lua:1325: in function 'update_forces'
YARM/resmon.lua:1347: in function 'on_tick_internal'
YARM/resmon.lua:1380: in function <YARM/resmon.lua:1375>"

Who would've expected the world to disappear out from under you, right? Thanks for also contributing a fix, will release shortly.

That's what friends are for :D