diff --git a/app/Http/Controllers/Admin/EditTemplate.php b/app/Http/Controllers/Admin/EditTemplate.php
index 8551f2b7..b50f63f9 100644
--- a/app/Http/Controllers/Admin/EditTemplate.php
+++ b/app/Http/Controllers/Admin/EditTemplate.php
@@ -120,6 +120,11 @@ class EditTemplate extends Controller
      */
     private function getNewRevisionNumber($template)
     {
+        // nothing to backup - no template in custom directory exists
+        if (!File::exists($template)) {
+            return null;
+        }
+
         $number = 0;
         while (File::exists($template . '.' . $number)) {
             $number++;
@@ -139,7 +144,7 @@ class EditTemplate extends Controller
         $number = $this->getNewRevisionNumber($template);
 
         // nothing to backup
-        if ($number == 0) {
+        if (is_null($number)) {
             return;
         }