diff --git a/.changeset/smart-gifts-shake.md b/.changeset/smart-gifts-shake.md
new file mode 100644
index 000000000..d78f7f1f7
--- /dev/null
+++ b/.changeset/smart-gifts-shake.md
@@ -0,0 +1,5 @@
+---
+"eslint-plugin-svelte": patch
+---
+
+fix(no-ununsed-class-name): fixed an error with @use at-rules
diff --git a/src/rules/no-unused-class-name.ts b/src/rules/no-unused-class-name.ts
index 24b5d6a47..0b3fe9e33 100644
--- a/src/rules/no-unused-class-name.ts
+++ b/src/rules/no-unused-class-name.ts
@@ -116,7 +116,10 @@ function findClassesInPostCSSNode(node: AnyNode): string[] {
     )
     return classes
   }
-  if (node.type === "root" || node.type === "atrule") {
+  if (
+    (node.type === "root" || node.type === "atrule") &&
+    node.nodes !== undefined
+  ) {
     return node.nodes.flatMap(findClassesInPostCSSNode)
   }
   return []