diff --git a/python/nav/ipdevpoll/shadows/__init__.py b/python/nav/ipdevpoll/shadows/__init__.py
index b1bfdfb793..b658064569 100644
--- a/python/nav/ipdevpoll/shadows/__init__.py
+++ b/python/nav/ipdevpoll/shadows/__init__.py
@@ -305,8 +305,8 @@ def _post_events_version_changes(self, containers):
                 netbox=containers.get(None, Netbox).get_existing_model(),
                 alert_type=ALERT_TYPE_MAPPING[alert_type],
                 varmap={
-                    "old_version": old_version,
-                    "new_version": new_version,
+                    "old_version": old_version if old_version else "N/A",
+                    "new_version": new_version if new_version else "N/A",
                 },
             ).save()