The g_hash_table_unref() function does not accept NULL. Passing NULL results in a glib warning being triggered. Check whether the hash table is not NULL and unref it only then. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_domain.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index b6ad118f1f..881c88d54c 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -11923,7 +11923,8 @@ qemuDomainRefreshStatsSchema(virDomainObj *dom) if (!schema) return -1; - g_hash_table_unref(priv->statsSchema); + if (priv->statsSchema) + g_hash_table_unref(priv->statsSchema); priv->statsSchema = schema; return 0; -- 2.39.1