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-rw-r--r--isys/isys.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/isys/isys.c b/isys/isys.c
index 0813e5054..65ee688b3 100644
--- a/isys/isys.c
+++ b/isys/isys.c
@@ -291,7 +291,14 @@ static PyObject * doMount(PyObject * s, PyObject * args) {
PyObject *tuple = PyTuple_New(2);
PyTuple_SetItem(tuple, 0, PyInt_FromLong(rc));
- PyTuple_SetItem(tuple, 1, PyString_FromString(err));
+
+ if (err == NULL) {
+ Py_INCREF(Py_None);
+ PyTuple_SetItem(tuple, 1, Py_None);
+ } else {
+ PyTuple_SetItem(tuple, 1, PyString_FromString(err));
+ }
+
PyErr_SetObject(PyExc_SystemError, tuple);
}