diff --git a/web/static/js/import.js b/web/static/js/import.js
index 74316ba..e7d457c 100644
--- a/web/static/js/import.js
+++ b/web/static/js/import.js
@@ -201,8 +201,9 @@ export function openImport({ list, cat, onListChange, onDone }) {
         e.open = true;
         rerender(e);
       });
-      li.append(e.error ? h("p", { class: "small muted" }, e.error) : null,
-        h("div", { class: "import-opts" }, ...opts), again);
+      // Native append() would print a null as the text "null".
+      if (e.error) li.append(h("p", { class: "small muted" }, e.error));
+      li.append(h("div", { class: "import-opts" }, ...opts), again);
       return li;
     }