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The mod Space Exploration (0.7.57) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event space-exploration::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function '__index'
__space-exploration__/scripts/launchpad-gui.lua:243: in function 'gui_update'
__space-exploration__/scripts/launchpad.lua in function 'callback'
__space-exploration__/scripts/event.lua:25: in function <__space-exploration__/scripts/event.lua:23>

This happens when I clone an area of tiles over a Cargo Launch Pad.
I select a number of tiles for cloning and when I paste them on top of a Cargo Launch Pad the game crashes with the above Notice.

Are you sure you mean cloning? Cloning is not something players typically do. Do you maybe mean copy-and-pasting?

And if you were really doing cloning then there's an chance this is out of our hands, since some editor commands don't provide the API events our code expected. Were you in the editor? And what tiles did you clone?

Its cloning in the editor menu and I was just cloning clean space with tiles

It makes sense in that case that the editor deleted some entities. Unfortunately this is a "Won't fix" for the moment, since being able to handle this correctly would require refactoring a large partion of the code base, which is not a priority at the moment.