diff --git a/src/tools/xpath-tester/xpath-tester.vue b/src/tools/xpath-tester/xpath-tester.vue
index 50298fa5..4ef3bf5c 100644
--- a/src/tools/xpath-tester/xpath-tester.vue
+++ b/src/tools/xpath-tester/xpath-tester.vue
@@ -12,7 +12,7 @@ const selectedNodes = computed(() => {
     return XPathEngine.select(xpath.value, doc);
   }
   catch (e: any) {
-    return e.toString();
+    return [e.toString()];
   }
 });