An error occurred while saving

Hello! An error occurred during saving and the following message: ActiveRecord::RecordNotUnique: PG::Unique Violation: ERROR: duplicate key value violates unique constraint “current_nodes_pkey1” DETAIL: Key (id) = ( ) already exists.

What needs to be done? And why could this have happened?

Can you provide a few more details about what you were actually trying to do?

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Hello.
I edited some building outlines and addresses, an error occurred when trying to save the changes and send them to the server.

Which server? I’ve never seen a message like that from OpenStreetMap itself

Which program you used to make edits?

I participate in a project to mark historical places and there is my own server, but they also cannot figure out the reasons.

Without programs, through OSM itself