.

bigfile/_bigfile.c

@@ -977,8 +977,13 @@ pyfile_new(PyTypeObject *type, PyObject *args, PyObject *kw)
     }
 
     self = (PyBigFile *)PyType_GenericNew(type, args, kw);
-    if (!self)
+    if (!self) {
+        Py_XDECREF(blkmmapper);
         return NULL;
+    }
+
+    self->blkmmapper_pycapsule = blkmmapper;
+    self->blkmmap_ops          = blkmmap_ops;
 
     // FIXME "k" = unsigned long - we need size_t
     static char *kw_list[] = {"blksize", NULL};