diff --git a/github_files.tf b/github_files.tf
index fdd479e..e526711 100644
--- a/github_files.tf
+++ b/github_files.tf
@@ -45,7 +45,7 @@ data "github_ref" "ref" {
 locals {
   extra_files = concat(
     var.extra_files,
-    local.lookup_sha == 1 && length(data.github_ref.ref) > 0 && data.github_ref.ref[0] != null ? [] : [
+    local.lookup_sha == 1 && length(data.github_ref.ref) > 0 && length(data.github_ref.ref) == 0 ? [] : [
       {
         path    = ".TEMPLATE_SHA",
         content = local.lookup_sha == 1 && length(data.github_ref.ref) > 0 ? data.github_ref.ref[0].sha : ""