diff --git a/homeassistant/components/device_tracker/unifi.py b/homeassistant/components/device_tracker/unifi.py
index 8663930c4e6..d8a52aaaeb4 100644
--- a/homeassistant/components/device_tracker/unifi.py
+++ b/homeassistant/components/device_tracker/unifi.py
@@ -98,7 +98,8 @@ class UnifiScanner(DeviceScanner):
         # Filter clients to provided SSID list
         if self._ssid_filter:
             clients = [client for client in clients
-                       if client['essid'] in self._ssid_filter]
+                       if 'essid' in client and
+                       client['essid'] in self._ssid_filter]
 
         self._clients = {
             client['mac']: client