diff --git a/app.py b/app.py
index 90a596a..f6e6d0e 100644
--- a/app.py
+++ b/app.py
@@ -38,7 +38,10 @@ def report():
 
 @app.route("/ts/<id>")
 def get_timeseries(id):
-    ts = LTS(id=id)
+    try:
+        ts = LTS(id=id)
+    except FileNotFoundError:
+        abort(404)
     return jsonify({"description": ts.description, "data": ts.data})
 
 def verify_node(d):