Here are steps to demonstrate this bug:

(1) Use AUCTeX to edit a ConTeXt file.
(2) Compile with 
    Alt-X TeX-command-master
    ConTeXt
(3) Get an error because of a mistake in the ConTeXt file.
(4) See an invitation to display errors with this message:
    ConTeXt Full errors in ‘*~/a output*’. Use C-c ` to display.
(5) Type
    C-c `

***What I expect:***
(6) To see information about the error.
***What actually happens:***
(6') AUCTeX says
    No more errors.

(7) I understand that there may be no ConTeXt users at AUCTeX headquarters,
    so here is a very small ConTeXt file showing the problem:

    %%% cut here %%%
    \starttext
    \xyzzy
    \stoptext
    %%% cut here %%%

    Here is the complete error message in that case:

    <<many lines of boilerplate ConTeXt log output of no interest>>
    ! Undefined control sequence
    tex error       > tex error on line 2 in file ./a.tex: 
    
    <line 3.2> 
            \xyzzy
    
    1         \starttext
    2 >>      \xyzzy
    3         \stoptext
    4     
    The control sequence at the end of the top line of your error message was 
never\def'ed. You can just continue as I'll forget about whatever was undefined.
    mtx-context     | fatal error: return code: 1
    
    TeX Output exited abnormally with code 1 at Sat Feb  7 14:42:40

(8) If I can be of any assistance testing a fix, don't hesitate to get back
    to me.

Thanks!

Emacs  : GNU Emacs 30.2 (build 1, x86_64-slackware-linux-gnu, GTK+ Version 
3.24.31, cairo version 1.16.0)
 of 2025-08-14
Package: 14.1.2

current state:
==============
(setq
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("~/.emacs.d/auctex/"
                  "/home/zsd/.emacs.d/elpa/auctex-14.1.2/style"
                  "/home/zsd/.emacs.d/auctex/auto"
                  "/home/zsd/.emacs.d/auctex/style" "auto" "style")
 TeX-auto-save nil
 TeX-parse-self t
 TeX-master t
 TeX-command-list '(("TeX"
                     "%(PDF)%(tex) %(file-line-error) %`%(extraopts) 
%S%(PDFout)%(mode)%' %(output-dir) %t"
                     TeX-run-TeX nil (plain-TeX-mode AmSTeX-mode Texinfo-mode)
                     :help "Run plain TeX")
                    ("LaTeX" "%`%l%(mode)%' %T" TeX-run-TeX nil
                     (LaTeX-mode docTeX-mode) :help "Run LaTeX")
                    ("Makeinfo" "makeinfo %(extraopts) %(o-dir) %t"
                     TeX-run-compile nil (Texinfo-mode) :help
                     "Run Makeinfo with Info output")
                    ("Makeinfo HTML" "makeinfo %(extraopts) %(o-dir) --html %t"
                     TeX-run-compile nil (Texinfo-mode) :help
                     "Run Makeinfo with HTML output")
                    ("AmSTeX"
                     "amstex %(PDFout) %`%(extraopts) %S%(mode)%' %(output-dir) 
%t"
                     TeX-run-TeX nil (AmSTeX-mode) :help "Run AMSTeX")
                    ("ConTeXt" "%(cntxcom) --once %(extraopts) %(execopts)%t"
                     TeX-run-TeX nil (ConTeXt-mode) :help "Run ConTeXt once")
                    ("ConTeXt Full" "%(cntxcom) %(extraopts) %(execopts)%t"
                     TeX-run-TeX nil (ConTeXt-mode) :help
                     "Run ConTeXt until completion")
                    ("BibTeX" "bibtex %(O?aux)" TeX-run-BibTeX nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode ConTeXt-mode)
                     :help "Run BibTeX")
                    ("Biber" "biber %(output-dir) %s" TeX-run-Biber nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Run Biber")
                    ("Texindex" "texindex %s.??" TeX-run-command nil
                     (Texinfo-mode) :help "Run Texindex")
                    ("Texi2dvi" "%(PDF)texi2dvi %t" TeX-run-command nil
                     (Texinfo-mode) :help "Run Texi2dvi or Texi2pdf")
                    ("View" "%V" TeX-run-discard-or-function t t :help
                     "Run Viewer")
                    ("Print" "%p" TeX-run-command t t :help "Print the file")
                    ("Queue" "%q" TeX-run-background nil t :help
                     "View the printer queue" :visible TeX-queue-command)
                    ("File" "%(o?)dvips %d -o %f " TeX-run-dvips t
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Generate PostScript file")
                    ("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Convert DVI file to PostScript")
                    ("Dvipdfmx" "dvipdfmx -o %(O?pdf) %d" TeX-run-dvipdfmx nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Convert DVI file to PDF with dvipdfmx")
                    ("Ps2pdf" "ps2pdf %f %(O?pdf)" TeX-run-ps2pdf nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Convert PostScript file to PDF")
                    ("LaTeXMk"
                     "latexmk %(latexmk-out) %(file-line-error) %(output-dir) 
%`%(extraopts) %S%(mode)%' %t"
                     TeX-run-TeX nil (LaTeX-mode docTeX-mode) :help
                     "Run LaTeXMk")
                    ("Glossaries" "makeglossaries %(d-dir) %s" TeX-run-command
                     nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Run makeglossaries to create glossary file")
                    ("Index" "makeindex %(O?idx)" TeX-run-index nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Run makeindex to create index file")
                    ("upMendex" "upmendex %(O?idx)" TeX-run-index t
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Run upmendex to create index file")
                    ("Xindy" "texindy %s" TeX-run-command nil
                     (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode
                      Texinfo-mode)
                     :help "Run xindy to create index file")
                    ("Check" "lacheck %s" TeX-run-compile nil (LaTeX-mode)
                     :help "Check LaTeX file for correctness")
                    ("ChkTeX" "chktex -v6 %s" TeX-run-compile nil (LaTeX-mode)
                     :help "Check LaTeX file for common mistakes")
                    ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil
                     t :help "Spell-check the document")
                    ("Clean" "TeX-clean" TeX-run-function nil t :help
                     "Delete generated intermediate files")
                    ("Clean All" "(TeX-clean t)" TeX-run-function nil t :help
                     "Delete generated intermediate and output files")
                    ("Other" "" TeX-run-command t t :help
                     "Run an arbitrary command")
                    )
 )



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