Debugger console started producing warnings for empty local variables "node value output already exists".
Start a vanilla new app, create a local client storage database and add it to any page.
Once you start the debugger the console will printing "node value output already exists" every 5 sec as per default on data flow. I had 2-3 databases on one of the page with 2 sec delay, so you get a constant stream of data - which at some stage crashes the debugger.
This must be from a new update as I have not seen it before.