Antoine Pitrou added the comment:
Following patch seems to fix it, but I have to cook a proper test:
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -786,7 +786,7 @@ map_to_dict(PyObject *map, Py_ssize_t nm
PyObject *key = PyTuple_GET_ITEM(map, j);
PyObject *value = values[j];
assert(PyUnicode_Check(key));
- if (deref) {
+ if (deref && value != NULL) {
assert(PyCell_Check(value));
value = PyCell_GET(value);
}
----------
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<http://bugs.python.org/issue21897>
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