1 files changed, 5 insertions, 0 deletions
diff --git a/src/state/host.rs b/src/state/host.rs
index 5751998..b4a785b 100644
--- a/src/state/host.rs
+++ b/src/state/host.rs
@@ -374,6 +374,11 @@ impl Host for AppState {
     ) -> impl Future<Output = Result<(), String>> + Send {
         let state = self.clone();
         async move {
+            // Downloaded: looked at before Automerge applies it (`misplaced_author`).
+            if let Some(misplaced) = crate::document::changes::misplaced_author(change.raw_bytes())
+            {
+                return Err(misplaced.to_string());
+            }
             tokio::task::spawn_blocking(move || {
                 let result = {
                     let mut replica = state.doc.blocking_write();