This looks like it occurs if a session opened has a view opened where a component in that view is missing their meta.name property.
If possible you may want to try while only one session is opened and navigate your pages until you hit this issue. Then open the views on that page in a designer and see if there’s any components that do not have their meta.name property. On the project browser I noticed they may sometimes have a ? for a name, for components like that just give them a name. I also noticed they may sometimes have a generic name (ie. a button called “Button”), for components like this you can rename them to something else and rename them back if you want.