diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
index e0bf0de4d6af..2e17a7aef99f 100644
--- a/lib/matplotlib/mathtext.py
+++ b/lib/matplotlib/mathtext.py
@@ -2859,10 +2859,12 @@ def subsuper(self, s, loc, toks):
             new_children = nucleus.children
             if len(new_children):
                 # remove last kern
-                if isinstance(new_children[-1],Kern):
+                if (isinstance(new_children[-1],Kern) and
+                        hasattr(new_children[-2], '_metrics')):
                     new_children = new_children[:-1]
                 last_char = new_children[-1]
-                last_char.width = last_char._metrics.advance
+                if hasattr(last_char, '_metrics'):
+                    last_char.width = last_char._metrics.advance
             # create new Hlist without kerning
             nucleus = Hlist(new_children, do_kern=False)
         else:
diff --git a/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_79.pdf b/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_79.pdf
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new file mode 100644
index 000000000000..909bbfbd16bb
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new file mode 100644
index 000000000000..00820a25b39e
--- /dev/null
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diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
index 3e5a74eece8a..21e0d25ca7e9 100644
--- a/lib/matplotlib/tests/test_mathtext.py
+++ b/lib/matplotlib/tests/test_mathtext.py
@@ -104,6 +104,7 @@
     r'testing$^{123}$',
     ' '.join('$\\' + p + '$' for p in sorted(mathtext.Parser._snowflake)),
     r'$6-2$; $-2$; $ -2$; ${-2}$; ${  -2}$; $20^{+3}_{-2}$',
+    r'$\overline{\omega}^x \frac{1}{2}_0^x$', # github issue #5444
 ]
 
 digits = "0123456789"