diff --git a/crates/engine/src/cmd/wireframe.rs b/crates/engine/src/cmd/wireframe.rs
index 5e7dd3f0d4..27a35a793b 100644
--- a/crates/engine/src/cmd/wireframe.rs
+++ b/crates/engine/src/cmd/wireframe.rs
@@ -47,7 +47,12 @@ fn expand_as_wireframes(s: &mut Session, p: &Value) -> Result<Value> {
     // they are.
     let d = &s.doc()?.doc;
     let mut wires = vec![];
+    let mut seen = std::collections::HashSet::new();
     for id in roots {
+        // An id given twice is expanded once.
+        if !seen.insert(id) {
+            continue;
+        }
         let Some(n) = d.node(id) else { continue };
         if !effects::has_revolve(n) && !effects::has_solid(n) {
             continue;
diff --git a/crates/engine/src/cmd/wireframe/tests.rs b/crates/engine/src/cmd/wireframe/tests.rs
index 69e83d4b4a..67e338b781 100644
--- a/crates/engine/src/cmd/wireframe/tests.rs
+++ b/crates/engine/src/cmd/wireframe/tests.rs
@@ -71,7 +71,8 @@ fn a_layer_with_a_3d_effect_stays_a_layer_holding_the_edges() {
     let layer = s.doc().unwrap().doc.layers[0].id;
     s.execute("effect.apply", &json!({"ids":[layer.0],"effect":"threeD.extrude","item":null,"params":{}})).unwrap();
     let history = undo_len(&s);
-    let out = run(&mut s, json!({"ids":[layer.0]})).unwrap();
+    // An id given twice is expanded once.
+    let out = run(&mut s, json!({"ids":[layer.0, layer.0]})).unwrap();
     assert_eq!(out["ids"], json!([layer.0]));
     let st = s.doc().unwrap();
     let node = st.doc.node(layer).unwrap();