diff --git a/uw_wcms_tools.gitlab.inc b/uw_wcms_tools.gitlab.inc
index 1dca0774eb6a1a31ff52e6879ea8fcaead167f79..39b010ff6c253bfa99ccfcc14b6a4127b78965aa 100644
--- a/uw_wcms_tools.gitlab.inc
+++ b/uw_wcms_tools.gitlab.inc
@@ -831,7 +831,7 @@ function uw_wcms_tools_gitlab_tag_release(string $namespace, string $path): void
       echo uw_wcms_tools_shell_color("Merge done.\n", 'green');
     }
   }
-  else {
+  elseif ($current_branches['rel'] && $current_branches['dev']) {
     echo 'Create ' . $current_branches['rel'] . ' from ' . $current_branches['dev'] . '... ';
     $params = [
       'branch' => $current_branches['rel'],
@@ -847,6 +847,9 @@ function uw_wcms_tools_gitlab_tag_release(string $namespace, string $path): void
       throw new Exception('Branch creation failed.');
     }
   }
+  else {
+    throw new Exception('Project does not have Drupal 8 or later version.');
+  }
 
   // Create tag.
   echo 'Tag ' . $current_branches['rel'] . ' as ' . $current_branches['tag_next'] . '... ';