1 files changed, 3 insertions, 0 deletions
diff --git a/Python/frame.c b/Python/frame.c
index 3d2415f..a5c93ea 100644
--- a/Python/frame.c
+++ b/Python/frame.c
@@ -99,6 +99,9 @@ take_ownership(PyFrameObject *f, InterpreterFrame *frame)
 int
 _PyFrame_Clear(InterpreterFrame * frame, int take)
 {
+    /* It is the responsibility of the owning generator/coroutine
+     * to have cleared the generator pointer */
+    assert(frame->generator == NULL);
     if (frame->frame_obj) {
         PyFrameObject *f = frame->frame_obj;
         frame->frame_obj = NULL;