how to track down "invalid face attribute" errors?

[Eric S Fraga]

Hello all,

some package I'm using is leading to errors of the form

  Invalid face attribute :foreground nil [54 times]

can anybody suggest how I can track down which package/function is
causing this?  Debugging on error doesn't catch this.  All web searches
lead me to specific packages that have had this error in the past (none
of which I use).

Thank you,
eric

-- 
Eric S Fraga via gnus (Emacs 29.0.50 2022-09-22) on Debian 11.4