diff --git a/packages/fps-importer/index.ts b/packages/fps-importer/index.ts
index 4a2386600..85a93924b 100644
--- a/packages/fps-importer/index.ts
+++ b/packages/fps-importer/index.ts
@@ -47,7 +47,7 @@ class FpsProblemImportHandler extends Handler {
                 // `filename` attribute introduced by winterant/OnlineJudge
                 // PLEASE, respect the spec
                 const filename = node.$?.filename || `${id}.${ext}`;
-                const c = node._ || node;
+                const c = node._ || (typeof node === 'string' ? node : '');
                 tasks.push(ProblemModel.addTestdata(domainId, pid, filename, Buffer.from(c)));
             };
             if (p.test_output) {
diff --git a/packages/ui-default/pages/problem_files.page.tsx b/packages/ui-default/pages/problem_files.page.tsx
index 93682098e..3d1532ce6 100644
--- a/packages/ui-default/pages/problem_files.page.tsx
+++ b/packages/ui-default/pages/problem_files.page.tsx
@@ -366,7 +366,7 @@ const page = new NamedPage('problem_files', () => {
     }
   }
 
-  if (UiContext.pdoc) {
+  if (UiContext.pdoc && $('[name="generate_testdata"]').length) {
     FileSelectAutoComplete.getOrConstruct($('[name=gen]'), { data: UiContext.pdoc.data });
     FileSelectAutoComplete.getOrConstruct($('[name=std]'), { data: UiContext.pdoc.data });
     $('[name="generate_testdata"]').on('click', handleGenerateTestdata);
diff --git a/packages/ui-default/templates/partials/nav.html b/packages/ui-default/templates/partials/nav.html
index cd241d190..c71be3926 100644
--- a/packages/ui-default/templates/partials/nav.html
+++ b/packages/ui-default/templates/partials/nav.html
@@ -106,13 +106,14 @@
           {% endif %}
           {% if ui.getNodes('UserDropdown').length %}
             <li class="menu__seperator"></li>
-            {%- for item in ui.getNodes('UserDropdown') -%}
+            {%- for item in ui.getNodes('UserDropdown') -%} {% if item.checker(handler) %}
             <li class="menu__item nojs--hide">
               {% set args = (item.args(handler) if typeof(item.args)=='function' else item.args) or {} %}
               <a href="{{ url(item.name, args) }}" class="menu__link">
                 <span class="icon icon-{{ args.icon }}"></span> {{ _(args.displayName or item.name) }}
               </a>
             </li>
+            {% endif %}
             {%- endfor -%}
           {% endif %}
           <li class="menu__seperator"></li>