diff --git a/charms/istio-pilot/src/charm.py b/charms/istio-pilot/src/charm.py
index 46de4a2f..bbbfec5a 100755
--- a/charms/istio-pilot/src/charm.py
+++ b/charms/istio-pilot/src/charm.py
@@ -431,10 +431,18 @@ def _get_ingress_data(self, event) -> dict:
         # Get all route data from the ingress interface
         routes = get_routes_from_ingress_interface(ingress_interface, self.app)
 
-        # The app-level data is still visible on a broken relation, but we
+        # The app-level data may still be visible on a broken relation, but we
         # shouldn't be keeping the VirtualService for that related app.
         if isinstance(event, RelationBrokenEvent) and event.relation.name == INGRESS_RELATION_NAME:
-            routes.pop((event.relation, event.app))
+            if event.app is None:
+                self.log.info(
+                    f"When handling event '{event}', event.app found to be None.  We cannot pop"
+                    f" the departing application's data from 'routes' because we do not know the"
+                    f" departing application's name.  We assume that the departing application's"
+                    f" is not in routes.keys='{list(routes.keys())}'."
+                )
+            else:
+                routes.pop((event.relation, event.app))
 
         return routes
 
diff --git a/charms/istio-pilot/tests/unit/test_charm.py b/charms/istio-pilot/tests/unit/test_charm.py
index 5d06445f..2d45da37 100644
--- a/charms/istio-pilot/tests/unit/test_charm.py
+++ b/charms/istio-pilot/tests/unit/test_charm.py
@@ -591,6 +591,21 @@ def test_get_ingress_data_for_broken_event(self, harness):
         this_relation = harness.model.get_relation("ingress", 0)
         assert ingress_data[(this_relation, this_relation.app)] == relation_info[0]["data"]
 
+    def test_get_ingress_data_for_broken_event_none_event_app(self, harness):
+        """Tests _get_ingress_data helper logs on RelationBroken event when event.app is None."""
+        harness.begin()
+        # Check for data while pretending this is a RelationBrokenEvent for relation[1] of the
+        # above relations.
+        mock_relation_broken_event = MagicMock(spec=RelationBrokenEvent)
+        mock_relation_broken_event.relation = harness.model.get_relation("ingress", 1)
+        mock_relation_broken_event.app = None
+
+        # Mock the logger
+        harness.charm.log = MagicMock()
+
+        harness.charm._get_ingress_data(mock_relation_broken_event)
+        assert harness.charm.log.info.call_count == 1
+
     def test_get_ingress_data_empty(self, harness):
         """Tests that the _get_ingress_data helper returns the correct empty relation data."""
         harness.begin()