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@@ -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: