diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
index 7085a986414e..9e20ea3da9b7 100644
--- a/lib/matplotlib/_mathtext.py
+++ b/lib/matplotlib/_mathtext.py
@@ -2521,10 +2521,10 @@ def subsuper(self, s: str, loc: int, toks: ParseResults) -> T.Any:
if len(new_children):
# remove last kern
if (isinstance(new_children[-1], Kern) and
- hasattr(new_children[-2], '_metrics')):
+ isinstance(new_children[-2], Char)):
new_children = new_children[:-1]
last_char = new_children[-1]
- if hasattr(last_char, '_metrics'):
+ if isinstance(last_char, Char):
last_char.width = last_char._metrics.advance
# create new Hlist without kerning
nucleus = Hlist(new_children, do_kern=False)
@@ -2600,7 +2600,7 @@ def subsuper(self, s: str, loc: int, toks: ParseResults) -> T.Any:
# Do we need to add a space after the nucleus?
# To find out, check the flag set by operatorname
- spaced_nucleus = [nucleus, x]
+ spaced_nucleus: list[Node] = [nucleus, x]
if self._in_subscript_or_superscript:
spaced_nucleus += [self._make_space(self._space_widths[r'\,'])]
self._in_subscript_or_superscript = False
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