Hi Arash,

Thanks for the follow-up, I've attached a minimal latex example that contains:
- an ignored warning (about a package's options)
- a non-ignored warning (missing citation label)

After compiling, the infinite loop is triggered when invoking `TeX-previous-error' after invoking `TeX-next-error'.

These are the relevant configuration options:
==
(setq TeX-debug-warnings t
      TeX-ignore-warnings #'my-ignore-TeX-warnings
      TeX-suppress-ignored-warnings t)

(defun my-ignore-TeX-warnings (type file line text &rest more)
      (let ((ref "LaTeX Warning: Reference")
            (cit "LaTeX Warning: Citation"))
         (and
            (not (string-match-p ref text))
            (not (string-match-p cit text)))))
==

Kind regards,

Bram Adams