diff --git a/ereuse_devicehub/resources/device/models.py b/ereuse_devicehub/resources/device/models.py
index 74d7ce97..300aeab9 100644
--- a/ereuse_devicehub/resources/device/models.py
+++ b/ereuse_devicehub/resources/device/models.py
@@ -353,6 +353,7 @@ class Device(Thing):
         actions.sort(key=lambda x: x.created)
         allocates =  []
         for act in actions:
+            lifetime = 0
             if act.type == 'Snapshot':
                 snapshot = act
                 lifestimes = snapshot.get_last_lifetimes()