Mmmmh @Pierre-Gilles … I see that this « critical » issue was closed by the stale bot but was never handled… I’ve reopened it:
I even think you had never paid attention to it… I just got caught again… luckily with new devices. I’m sending you back to the original post:
You just have to reply with anything for the « stale » label to be removed on GitHub.
Yes, @spenceur, for someone who hadn’t created the issue, but I reopened it right away because I was the initiator!
The forum thread is mainly to rethink it and be able to address it ^^
Indeed! Thanks for recreating the issue 
I’ve just handled the issue in this PR: MQTT: Add conflict error when creating a device with same selector by Pierre-Gilles · Pull Request #1902 · GladysAssistant/Gladys · GitHub
This PR has been merged into master and will be included in the next Gladys release.
Thank you for reporting this bug 
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Live fix in Gladys Assistant 4.29 :
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