[py] check if filter was created before deleting it

diff --git a/python/ext/py-filter.c b/python/ext/py-filter.c
index e10a8ed..861f8cd 100644 (file)
--- a/python/ext/py-filter.c
+++ b/python/ext/py-filter.c
@@ -109,7 +109,8 @@ static void
 Py_filter_del (Py_filter * self)
 {
   Py_XDECREF(self->out);
 Py_filter_del (Py_filter * self)
 {
   Py_XDECREF(self->out);

-  del_aubio_filter (self->o);
+  if (self->o)
+    del_aubio_filter (self->o);

   Py_TYPE(self)->tp_free ((PyObject *) self);
 }
 
   Py_TYPE(self)->tp_free ((PyObject *) self);
 }