diff --git a/src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Validation/SemanticValidator.cs b/src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Validation/SemanticValidator.cs
index 3e2849b2..adfee73d 100644
--- a/src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Validation/SemanticValidator.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Validation/SemanticValidator.cs
@@ -312,7 +312,7 @@ public class SemanticValidator
             }
 
             // ── Rule 2: default-value parseability ───────────────────────────
-            if (!string.IsNullOrEmpty(attr.Value))
+            if (!string.IsNullOrWhiteSpace(attr.Value))
             {
                 try
                 {