diff --git a/homeassistant/components/logbook.py b/homeassistant/components/logbook.py
index 3a2c1e137cb..45ee7a2e319 100644
--- a/homeassistant/components/logbook.py
+++ b/homeassistant/components/logbook.py
@@ -132,7 +132,7 @@ def humanify(events):
         # Process events
         for event in events_batch:
             if event.event_type == EVENT_STATE_CHANGED:
-                entity_id = event.data['entity_id']
+                entity_id = event.data.get('entity_id')
 
                 if entity_id is None:
                     continue