Uncaught TypeError: Cannot read property 'length' of undefined

Hello. Someone can say me, why is this bug appearing today?

I have done nothing today, and atom has begining to generate this bug, and I cannot writte in my code. Why? What´s happenned?

Does it appear when you open Atom from the command line with atom --safe?

no, the error appears when I open “atom” from my folder

If it doesn’t appear in safe mode, then that suggests that a package is creating the error. You can disable packages one at a time until you find the perpetrator.

Also, if the error only happens when you open a specific project, then clearing saved state may clear up the error if it pops up repeatedly but note the warning about unsaved data.

You can also subscribe to the issue mentioned in the error for updates if you like (if you click on the View Issue button).

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