Index: Objects/genobject.c
===================================================================
--- Objects/genobject.c	(Revision 52359)
+++ Objects/genobject.c	(Arbeitskopie)
@@ -355,6 +355,7 @@
 		Py_DECREF(f);
 		return NULL;
 	}
+	Py_INCREF(f);
 	gen->gi_frame = f;
 	gen->gi_running = 0;
 	gen->gi_weakreflist = NULL;