TypeError: null is not an object (evaluating 'sl.name')

[cargeo]

When exporting one or multiple artboards via "Export selected to HTML", I get the following error:
TypeError: null is not an object (evaluating 'sl.name')

Additionally some artboards get all their symbols detached. (This seems a side effect with every error of this plugin)

I get this error only occasionally and I don't know what it causes. The same artboards/document who throw this error are sometimes totally OK later that day.

Can you help?

[MaxBazarov]

Try to set "Enable Element Inspector" on in Configure Export dialog.

[cargeo]

Export works with "Enable Element Inspector" enabled. But I'd like to disable/hide it for my presentation.