diff --git a/backend/LexBoxApi/Services/HgService.cs b/backend/LexBoxApi/Services/HgService.cs
index 80601914a..32e328943 100644
--- a/backend/LexBoxApi/Services/HgService.cs
+++ b/backend/LexBoxApi/Services/HgService.cs
@@ -271,7 +271,7 @@ private string[] GetWsList(System.Xml.XmlElement root, string tagName)
     {
         var result = await ExecuteHgCommandServerCommand(code, "flexmodelversion", token);
         var text = await result.ReadAsStringAsync(token);
-        if (string.IsNullOrEmpty(text)) return null;
+        if (string.IsNullOrWhiteSpace(text)) return null;
         try
         {
             var json = JsonDocument.Parse(text);