diff --git a/lib/pleroma/signature.ex b/lib/pleroma/signature.ex
index 0bf49fd7c..15bf3c317 100644
--- a/lib/pleroma/signature.ex
+++ b/lib/pleroma/signature.ex
@@ -15,7 +15,7 @@ def key_id_to_actor_id(key_id) do
       |> Map.put(:fragment, nil)
 
     uri =
-      if String.ends_with?(uri.path, "/publickey") do
+      if not is_nil(uri.path) and String.ends_with?(uri.path, "/publickey") do
         Map.put(uri, :path, String.replace(uri.path, "/publickey", ""))
       else
         uri