Pluto Notebook becomes unresponsive: TypeError: e.cell_results[r] is undefined

[schlichtanders]

I want to report that during extensive work with Pluto on an instable internet connection, I get the following javascript error some times

An error occured in the CodeMirror code, resetting CellInput component. See error below:

TypeError: e.cell_results[r] is undefined

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This error is shown in the browser dev console. The Pluto notebook seems to be frozen after this

A simple workaround is to duplicate the tab and create a new connection. Nevertheless it will be great for users, if Pluto can survive such an error itself.

I am myself further investigating this issue. I don't have any reproducible example yet, but think this is is valuable to be tracked even at this stage.