Just picked up a crash. Will update with more info as it arises.

The mod Ghost Scanner 4 (4.0.4) caused a non-recoverable error.. In editor
Please report this error to the mod author.

Error while running event GhostScanner4::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__GhostScanner4/control.lua:393: in function 'UpdateSensor'
GhostScanner4/control.lua:450: in function <GhostScanner4/control.lua:441>

Update: I loaded a previous save and a few seconds after I cut the ghost scanner along with some combinators to move them I got the same error.

Hmm, I bet the editor doesn't call the expected created/destroyed events when messing with entities.

I'm unfamiliar with the editor, could you give me step by step instructions on how you're performing a "cut"?

I use ctrl-x and drag a selection box over the desired items to cut.

I got an error in the editor extensions editor mode as well when doing a cut over a ghost scanner

The mod Ghost Scanner 4 (4.0.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event GhostScanner4::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__GhostScanner4/control.lua:394: in function 'UpdateSensor'
GhostScanner4/control.lua:451: in function <GhostScanner4/control.lua:442>