diff --git a/Python/ceval.c b/Python/ceval.c
index e371d34..00b2e6d 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -5027,7 +5027,7 @@
             PyObject *names = f->f_code->co_names;
             PyObject *name = GETITEM(names, oparg);
             PyObject *locals = f->f_locals;
-            if (PyDict_CheckExact(locals) &&
+            if (locals && PyDict_CheckExact(locals) &&
                 PyDict_GetItem(locals, name) == v) {
                 if (PyDict_DelItem(locals, name) != 0) {
                     PyErr_Clear();