Commit 2b4bd07e0a22 (Add check for params, nparams being a dictionary) changed the way the optional params argument is treated. If libvirt.virDomain.blockCopy() is called without specifying params, params is None, and the call will fail with: TypeError: block params must be a dictionary This is wrong as params is defined as kwarg, breaking existing libvirt users like oVirt. Add a check for Py_None, so we accept either a dict or None and fail with TypeError with anything else. Resolves: https://bugzilla.redhat.com/1687114 Signed-off-by: Nir Soffer <nsoffer(a)redhat.com&gt; --- libvirt-override.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libvirt-override.c b/libvirt-override.c index 857c018..c5e2908 100644 --- a/libvirt-override.c +++ b/libvirt-override.c @@ -8835,11 +8835,11 @@ libvirt_virDomainBlockCopy(PyObject *self ATTRIBUTE_UNUSED, if (virPyDictToTypedParams(pyobj_dict, &params, &nparams, virPyDomainBlockCopyParams, VIR_N_ELEMENTS(virPyDomainBlockCopyParams)) < 0) { return NULL; } - } else { + } else if (pyobj_dict != Py_None) { PyErr_Format(PyExc_TypeError, "block params must be a dictionary"); return NULL; } dom = (virDomainPtr) PyvirDomain_Get(pyobj_dom); -- 2.17.2