The mod Robot Mining Site caused a non-recoverable error.
Please report this error to the mod author.

Error while running event robotMiningSite::on_pre_player_mined_item (ID 11)
real number expected got nil.
stack traceback:
robotMiningSite/control/robotMiningSite.lua:202: in function 'premine'
robotMiningSite/libs/control/entities.lua:202: in function 'entities_pre_mined'
robotMiningSite/control.lua:93: in function <robotMiningSite/control.lua:92>
stack traceback:
[C]: in function 'get_inventory'
robotMiningSite/control/robotMiningSite.lua:202: in function 'premine'
robotMiningSite/libs/control/entities.lua:202: in function 'entities_pre_mined'
robotMiningSite/control.lua:93: in function <robotMiningSite/control.lua:92>

Fix: On line 202 of robotMiningSite change the defines.inventory.player_main to defines.inventory.character_main

Probably other issues on the most recent version of factorio. That's what I get for playing unstable, huh? I'll post fixes as I find them.

Can confirm this bug. If I try to remove a mining site without using it, the game crashes. I guess an internal counter used to show how much has been mined or how much inventory is stored is not initialized in the correct way causing the issue

fixed in new release