diff --git a/inventory_lxc.py b/inventory_lxc.py
index 26f32d3..71a8c2f 100755
--- a/inventory_lxc.py
+++ b/inventory_lxc.py
@@ -19,7 +19,10 @@ for ctname in ctnames:
 	ct = lxc.Container(ctname)
 
 	if ct.running:
-		for group in ct.get_running_config_item('lxc.group').rstrip().split('\n'):
+		groups = ct.get_running_config_item('lxc.group')
+		if not groups:
+			groups = 'ungrouped'
+		for group in groups.rstrip().split('\n'):
 			if not group in inventory:
 				inventory[group] = {
 					'hosts': [],
diff --git a/inventory_lxc_ip.py b/inventory_lxc_ip.py
index 06537ee..ffa4522 100755
--- a/inventory_lxc_ip.py
+++ b/inventory_lxc_ip.py
@@ -19,7 +19,10 @@ for ctname in ctnames:
 	ct = lxc.Container(ctname)
 
 	if ct.running:
-		for group in ct.get_running_config_item('lxc.group').rstrip().split('\n'):
+		groups = ct.get_running_config_item('lxc.group')
+		if not groups:
+			groups = 'ungrouped'
+		for group in groups.rstrip().split('\n'):
 			if not group in inventory:
 				inventory[group] = {
 					'hosts': [],