TypeError: bt(...) is undefined

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Hi there
A very strange issue occurs. May be I missed something.
Randomly (?), I have this error displayed in my console window

TypeError: bt(…) is undefined
I see no result on google! More over, ‘bt’ is not on the code I wrote.
Concretely, only some of the repetitor items is detected…
Thank you for your support

2

[UPDATE]
This error disappeared.
One of the possible reason is that I was double connected ont the editor, with FF and GC…
It may have come from this.