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-rw-r--r--py/runtime.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/py/runtime.c b/py/runtime.c
index f7e08e37f5..65bb808a9b 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -915,6 +915,7 @@ mp_obj_t mp_iternext(mp_obj_t o_in) {
// TODO: Unclear what to do with StopIterarion exception here.
mp_vm_return_kind_t mp_resume(mp_obj_t self_in, mp_obj_t send_value, mp_obj_t throw_value, mp_obj_t *ret_val) {
+ assert((send_value != MP_OBJ_NULL) ^ (throw_value != MP_OBJ_NULL));
mp_obj_type_t *type = mp_obj_get_type(self_in);
if (type == &mp_type_gen_instance) {