diff --git a/AppImage/scripts/ovs_topology.py b/AppImage/scripts/ovs_topology.py
index 4d4792cd..c2b44caa 100644
--- a/AppImage/scripts/ovs_topology.py
+++ b/AppImage/scripts/ovs_topology.py
@@ -31,7 +31,7 @@ def _rows(table):
 
 
 def _list(value):
-    return value if isinstance(value, list) else [value] if value else []
+    return value if isinstance(value, list) else [] if value is None or value == '' else [value]
 
 
 def parse_topology(bridges, ports, interfaces):
diff --git a/AppImage/scripts/tests/test_ovs_topology.py b/AppImage/scripts/tests/test_ovs_topology.py
index 6a0061de..dadde489 100644
--- a/AppImage/scripts/tests/test_ovs_topology.py
+++ b/AppImage/scripts/tests/test_ovs_topology.py
@@ -64,6 +64,11 @@ class OvsTopology(unittest.TestCase):
         self.assertIsNone(data['bonds']['uplink']['bond_active_slave'])
         self.assertEqual(data['ports']['eno2']['bond_master'], 'uplink')
 
+    def test_zero_vlan_tag_is_preserved(self):
+        tables = fixture()
+        tables[1]['data'][3][4] = 0
+        self.assertEqual(ovs.parse_topology(*tables)['ports']['vlan100']['ovs_tag'], 0)
+
     def test_no_ovs_does_not_spawn_any_process(self):
         with patch.object(ovs.shutil, 'which', return_value=None), patch.object(ovs.subprocess, 'run') as run:
             self.assertEqual(ovs.get_topology(), {})