when you enter repr, you must leave, too (#25455)
diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index df97b5e..b01167b 100644
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -1236,6 +1236,7 @@
 
         repr = PyString_FromFormat("<Element %s at %p>",
                                    PyString_AS_STRING(tag), self);
+        Py_ReprLeave((PyObject *)self);
         Py_DECREF(tag);
         return repr;
     }