diff --git a/bazarr/analytics.py b/bazarr/analytics.py
index 1eccd37a0..30d509baf 100644
--- a/bazarr/analytics.py
+++ b/bazarr/analytics.py
@@ -29,6 +29,8 @@ def track_event(category=None, action=None, label=None):
     try:
         if settings.analytics.visitor:
             visitor = pickle.loads(base64.b64decode(settings.analytics.visitor))
+        if visitor.user_agent is None:
+            visitor.user_agent = os.environ.get("SZ_USER_AGENT")
         if visitor.unique_id > int(0x7fffffff):
             visitor.unique_id = random.randint(0, 0x7fffffff)
     except: