Fix wrong-type-argument integer-or-marker-p nil error

* lisp/textmodes/reftex-auc.el (reftex-what-index-tag):
Fix (wrong-type-argument integer-or-marker-p nil) error (bug#22077).

Copyright-paperwork-exempt: yes

diff --git a/lisp/textmodes/reftex-auc.el b/lisp/textmodes/reftex-auc.el
index bbad065c4ba82329a09e3b6bd36895103c60ef99..151be592367f44d1c077741decbe8cfbfbf2e2c5 100644 (file)
--- a/lisp/textmodes/reftex-auc.el
+++ b/lisp/textmodes/reftex-auc.el
@@ -137,7 +137,7 @@ argument identify one of multiple indices."
        ((stringp tag) tag)
        ((integerp tag)
         (save-excursion
-          (goto-char (match-end 1))
+          (goto-char (match-end 0))
           (or (reftex-nth-arg tag (nth 6 entry)) "idx")))
        (t "idx")))))