The mod Combat Robot Overhaul (2.1.26) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event CombatRobotsOverhaul::on_built_entity (ID 6)
Unknown item name: tile-ghost-capsule
stack traceback:
[C]: in function 'insert'
CombatRobotsOverhaul/control.lua:349: in function <CombatRobotsOverhaul/control.lua:343>

This crash occurs when I try to place blueprints for space platform foundation.

Thanks for the report. Seems like the event filter still doesn't work properly. I implemented a workaround to prevent the cause while I investigate the issue. Should be fixed as of version 2.1.27.

Thank you for the prompt fix, unfortunately now I am getting this crash when I try to remove space foundation blueprints (deconstructing physical space platform foundation is fine, just trying to clear blueprints causes the crash)

Error while running event CombatRobotsOverhaul::on_pre_player_mined_item (ID 14)
CombatRobotsOverhaul/control.lua:154: attempt to index a nil value
stack traceback:
CombatRobotsOverhaul/control.lua:154: in function <CombatRobotsOverhaul/control.lua:149>

I was able to find the issue in the event filter. Hopefully now it works in 2.1.28.