diff --git a/crates/loro-internal/src/fuzz.rs b/crates/loro-internal/src/fuzz.rs
index 66a611f4..17174808 100644
--- a/crates/loro-internal/src/fuzz.rs
+++ b/crates/loro-internal/src/fuzz.rs
@@ -156,10 +156,12 @@ impl Actionable for Vec<LoroCore> {
                 text.delete(&txn, *pos, *len).unwrap();
             }
             Action::Sync { from, to } => {
-                let (from, to) = arref::array_mut_ref!(self, [*from as usize, *to as usize]);
-                let to_vv = to.vv_cloned();
-                let from_exported = from.export(to_vv);
-                to.import(from_exported);
+                if from != to {
+                    let (from, to) = arref::array_mut_ref!(self, [*from as usize, *to as usize]);
+                    let to_vv = to.vv_cloned();
+                    let from_exported = from.export(to_vv);
+                    to.import(from_exported);
+                }
             }
             Action::SyncAll => {
                 for i in 1..self.len() {