diff --git a/lib/modules/manager/kustomize/extract.ts b/lib/modules/manager/kustomize/extract.ts
index a80836473bfee3629eede89de7f4326948e08540..1f3a40b592b2fd2c6e22c8005464c9a6b7e933bf 100644
--- a/lib/modules/manager/kustomize/extract.ts
+++ b/lib/modules/manager/kustomize/extract.ts
@@ -132,7 +132,7 @@ export function parseKustomize(content: string): Kustomize | null {
     return null;
   }
 
-  if (!pkg) {
+  if (!pkg || is.string(pkg)) {
     return null;
   }