diff --git a/app/models/additionals_info.rb b/app/models/additionals_info.rb
index dc3bdd20..87d755bd 100644
--- a/app/models/additionals_info.rb
+++ b/app/models/additionals_info.rb
@@ -29,8 +29,14 @@ def system_infos
 
   def system_info
     if Redmine::Platform.mswin?
-      win_info = `wmic os get Caption,CSDVersion,BuildNumber /value`
-      return 'unknown' if win_info.blank?
+      unkwown_windows = 'Windows'
+      begin
+        win_info = `wmic os get Caption,CSDVersion,BuildNumber /value`
+        win_info = Redmine::CodesetUtil.replace_invalid_utf8 win_info
+        return unkwown_windows if win_info.blank?
+      rescue StandardError
+        return unkwown_windows
+      end
 
       windows_version = ''
       windows_build = ''