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When I browse to https://copr.fedorainfracloud.org/coprs/msimacek/koschei/edit/ (this is not my Copr, but I have admin permission there) and then click Update (even without changing anything), I get the following error: You already have project named 'koschei'.
Fixed by https://pagure.io/copr/copr/c/eeb1df7d05db03cf629e3c527671948d8c051162?branch=master.
New COPR version has been released.