diff --git a/app.py b/app.py
index ba23e16..dce07d3 100644
--- a/app.py
+++ b/app.py
@@ -219,7 +219,7 @@ def _get_file_url(url, size, kind):
         return u
 
     # MEDIA_CACHE.cache(url, kind)
-    app.logger.error("cache not available for {url}/{size}/{kind}")
+    app.logger.error(f"cache not available for {url}/{size}/{kind}")
     return url
 
 
diff --git a/templates/utils.html b/templates/utils.html
index 78cd27d..8b15a1a 100644
--- a/templates/utils.html
+++ b/templates/utils.html
@@ -40,7 +40,7 @@
 
 	{% if not perma %}
 	<span style="float:right;width: 20%;text-align: right;overflow: hidden;white-space: nowrap;text-overflow: ellipsis;display: block;">
-		<a rel="noopener" class="u-url u-uid note-permalink l" href="{{ obj.url | get_url }}">
+		<a rel="noopener" class="u-url u-uid note-permalink l" href="{{ obj | url_or_id | get_url }}">
 			<time class="dt-published" title="{{ obj.published }}" datetime="{{ obj.published }}">{{ obj.published | format_timeago }}</time></a>
 	</span>
 	{% endif %}
diff --git a/utils/lookup.py b/utils/lookup.py
index 07627b6..3e97bfb 100644
--- a/utils/lookup.py
+++ b/utils/lookup.py
@@ -10,9 +10,10 @@ from little_boxes.webfinger import get_actor_url
 def lookup(url: str) -> ap.BaseActivity:
     """Try to find an AP object related to the given URL."""
     try:
-        actor_url = get_actor_url(url)
-        if actor_url:
-            return ap.fetch_remote_activity(actor_url)
+        if url.startswith('@'):
+            actor_url = get_actor_url(url)
+            if actor_url:
+                return ap.fetch_remote_activity(actor_url)
     except NotAnActivityError:
         pass
     except requests.HTTPError: