diff --git a/crates/engine/src/cmd/page.rs b/crates/engine/src/cmd/page.rs
index fefd8c73..2835deff 100644
--- a/crates/engine/src/cmd/page.rs
+++ b/crates/engine/src/cmd/page.rs
@@ -94,7 +94,7 @@ pub fn specs() -> Vec<CommandSpec> {
             ok()
         }),
         spec!("page.duplicate", "Duplicate page", "{id?}", true, |s, p| {
-            let src = id(p, "id").unwrap_or(s.page()?);
+            let src = page_target(s, "page.duplicate", p)?;
             let doc = s.doc_mut()?;
             let name = format!("Copy of {}", doc.get(src)?.name);
             let np = doc.add_page(&name);
diff --git a/crates/engine/src/page_target_tests.rs b/crates/engine/src/page_target_tests.rs
index fd88685d..348ffdf3 100644
--- a/crates/engine/src/page_target_tests.rs
+++ b/crates/engine/src/page_target_tests.rs
@@ -61,3 +61,13 @@ fn page_commands_still_work_on_pages() {
     assert!(!s.doc().unwrap().contains(second));
     assert!(s.execute("page.delete", &json!({"id": first})).is_err(), "the last ordinary page stays");
 }
+
+#[test]
+fn page_duplicate_rejects_a_frame() {
+    let mut s = Session::new();
+    let f = id_of(&ex(&mut s, "frame.create", json!({"x": 0, "y": 0, "width": 100, "height": 100})));
+    let pages = s.doc().unwrap().pages.clone();
+    let err = s.execute("page.duplicate", &json!({"id": f})).expect_err("duplicate refuses a layer");
+    assert!(err.to_string().contains("is not a page"), "{err}");
+    assert_eq!(s.doc().unwrap().pages, pages, "no page was added");
+}