diff --git a/cave/src/activitypub/mod.rs b/cave/src/activitypub/mod.rs
index 5ff4cc7..607ef91 100644
--- a/cave/src/activitypub/mod.rs
+++ b/cave/src/activitypub/mod.rs
@@ -116,7 +116,10 @@ impl Post {
                 while tag.name.chars().next() == Some('#') {
                     tag.name.remove(0);
                 }
-                if tag.name.len() > 0 {
+                if tag.name.chars.next() == Some('@') {
+                    // why do these occur?
+                    None
+                } else if tag.name.len() > 0 {
                     Some(tag)
                 } else {
                     None