When give a nonzero flags to getTime, c_retval will get -1 and goto cleanup. But py_retval still is NULL,so set py_retval = VIR_PY_NONE. This will make the output message more correct. error will disappear: SystemError: error return without exception set v2: https://www.redhat.com/archives/libvir-list/2014-October/msg00497.html Signed-off-by: Luyao Huang <lhuang(a)redhat.com&gt; --- libvirt-override.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/libvirt-override.c b/libvirt-override.c index 9ba87eb..8690f4f 100644 --- a/libvirt-override.c +++ b/libvirt-override.c @@ -7757,9 +7757,11 @@ libvirt_virDomainGetTime(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { c_retval = virDomainGetTime(domain, &seconds, &nseconds, flags); LIBVIRT_END_ALLOW_THREADS; - if (c_retval < 0) + if (c_retval < 0) { + py_retval = VIR_PY_NONE; goto cleanup; - + } + if (!(pyobj_seconds = libvirt_longlongWrap(seconds)) || PyDict_SetItemString(dict, "seconds", pyobj_seconds) < 0) goto cleanup; -- 1.8.3.1