diff --git a/app/controllers/concerns/signature_verification.rb b/app/controllers/concerns/signature_verification.rb
index 6f3b93dfcd..fd1e2fafb2 100644
--- a/app/controllers/concerns/signature_verification.rb
+++ b/app/controllers/concerns/signature_verification.rb
@@ -142,6 +142,7 @@ module SignatureVerification
               # Only refreshing keys, skipping potentially more expensive requests
               ActivityPub::FetchRemoteActorService.new.call(keypair.actor.uri, only_key: true, suppress_errors: false)
             end
+    return if actor.nil?
 
     keypair_uri = keypair.uri