diff --git a/homeassistant/components/prowl/notify.py b/homeassistant/components/prowl/notify.py
index 725c3b9de30..802679ab03d 100644
--- a/homeassistant/components/prowl/notify.py
+++ b/homeassistant/components/prowl/notify.py
@@ -48,7 +48,7 @@ class ProwlNotificationService(BaseNotificationService):
             "description": message,
             "priority": data["priority"] if data and "priority" in data else 0,
         }
-        if data.get("url"):
+        if data and data.get("url"):
             payload["url"] = data["url"]
 
         _LOGGER.debug("Attempting call Prowl service at %s", url)