diff --git a/cache_add_validator_check.ts b/cache_add_validator_check.ts
new file mode 100644
index 000000000..9d512e6e5
--- /dev/null
+++ b/cache_add_validator_check.ts
@@ -0,0 +1,6 @@
+export function cache_add_validator_check_dfcf(input: unknown): unknown {
+  if (input === null || input === undefined) {
+    return undefined;
+  }
+  return input;
+}