diff --git a/files/mail/__init__.py b/files/mail/__init__.py
index c2e118cc2..66b743bec 100644
--- a/files/mail/__init__.py
+++ b/files/mail/__init__.py
@@ -61,6 +61,7 @@ def activate(v):
 
 
 	id = request.values.get("id", "").strip()
+	if not id: abort(400)
 	timestamp = int(request.values.get("time", "0"))
 	token = request.values.get("token", "").strip()