diff --git a/app/terraform/block_mirror.py b/app/terraform/block_mirror.py
index a84d0fc..f86c455 100644
--- a/app/terraform/block_mirror.py
+++ b/app/terraform/block_mirror.py
@@ -2,7 +2,7 @@ from datetime import datetime, timedelta
 import logging
 from abc import abstractmethod
 import fnmatch
-from typing import Tuple, List, Any
+from typing import Tuple, List, Any, Optional
 
 from app.extensions import db
 from app.models.activity import Activity
@@ -30,7 +30,8 @@ class BlockMirrorAutomation(BaseAutomation):
         for pattern in self.patterns:
             blocked_urls = fnmatch.filter(proxy_urls, pattern)
             for blocked_url in blocked_urls:
-                proxy = proxy_by_url(blocked_url)
+                if not (proxy := proxy_by_url(blocked_url)):
+                    continue
                 logging.debug("Found %s blocked", proxy.url)
                 if not proxy.origin.auto_rotation:
                     logging.debug("Proxy auto-rotation forbidden for origin")
@@ -79,7 +80,7 @@ def active_proxy_urls() -> List[str]:
     ).all()]
 
 
-def proxy_by_url(url: str) -> Proxy:
+def proxy_by_url(url: str) -> Optional[Proxy]:
     return Proxy.query.filter(  # type: ignore[no-any-return]
         Proxy.deprecated.is_(None),
         Proxy.destroyed.is_(None),