When you go to a folder the app can't access or the file path gets malformed in some way the app just crashes. Looking at the code it seems that this behaviour stems from the Update function on the ListModel. I suggest doing some form of error validation to check if the error is recoverable or indeed a panic must happen.

Due to the fact that this implies some design decisions as to how to handle this from a UI perspective I don't think that doing a pull request with my own solution will be beneficial. If there is anything I can help with let me know.