I selected a bunch of buildings and pressed CTRL+C, then the message below popped up. There were no miniloaders in the copied section.
The mod Miniloader (1.14.5) 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:128: attempt to index field 'previous_opened_blueprint_for' (a nil value)
stack traceback:
miniloader/lualib/blueprint.lua:128: in function 'get_blueprint_to_setup'
miniloader/control.lua:327: in function 'handler'
miniloader/lualib/event.lua:15: in function <miniloader/lualib/event.lua:13>