An error occurred while loading the web debug toolbar (500: )

[magneto0007]

Hi

I have installed & enabled the module along with DB debug.

When I visit any store page, I get a pop up with a message "An error occurred while loading the web debug toolbar (500: )".

In the network tab I can see the ajax call to _debug/profiler/toolbar is failing with 500 and causing the above error message.

The ajax call is to a controller debug/profiler/toolbar/token/c80b7f/

I can see there's an error log in debug.log "Profile with token %s doesn't exist."

Any help appreciated.