1 files changed, 1 insertions, 0 deletions
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 6b7b150f0e2..be62ae5eefd 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -4411,6 +4411,7 @@ dict_setdefault_ref_lock_held(PyObject *d, PyObject *key, PyObject *default_valu
             if (result) {
                 *result = NULL;
             }
+            return -1;
         }
 
         STORE_USED(mp, mp->ma_used + 1);