I had built out a small (5-6 entity) setup I wanted to repeat, happened to have a placed chute and a ghost of a chute. I pressed Ctrl+C to copy, selected the area I wanted to copy, and got the following:

The mod Miniloader (1.15.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event miniloader::on_player_setup_blueprint (ID 69)
miniloader/lualib/blueprint.lua:22: attempt to index field '?' (a nil value)
stack traceback:
miniloader/lualib/blueprint.lua:22: in function 'tag_with_configuration'
miniloader/lualib/blueprint.lua:158: in function 'filter_miniloaders'
miniloader/control.lua:379: in function 'handler'
miniloader/lualib/event.lua:15: in function <miniloader/lualib/event.lua:13>

Just tried to get it repeatable. Can replicate it 100% of the time by placing a ghost of a chute, and then attempting to copy it.

Thanks for the report! Fixed in v1.15.5.

Thanks for the super quick fix, and all the work you do with your mods. =)

2-3 of them have been personal must haves for years!