runner.rb in fastlane-2.103.0

- old
+ new

@@ -120,9 +120,18 @@
       return if Snapshot.config[:skip_helper_version_check]
       current_version = version_of_bundled_helper
       UI.verbose("Checking that helper files contain #{current_version}")
 
       helper_files = Update.find_helper
+      if helper_files.empty?
+        UI.error("Your Snapshot Helper file is missing, please place a copy")
+        UI.error("in your project directory")
+        UI.message("More information about Snapshot setup can be found here:")
+        UI.message("https://docs.fastlane.tools/actions/snapshot/#quick-start")
+        UI.user_error!("Please add a Snapshot Helper file to your project")
+        return
+      end
+
       helper_files.each do |path|
         content = File.read(path)
 
         unless content.include?(current_version)
           UI.error("Your '#{path}' is outdated, please run `fastlane snapshot update`")