diff --git a/Contentstack.Management.Core/Services/Models/PublishUnpublishService.cs b/Contentstack.Management.Core/Services/Models/PublishUnpublishService.cs
index d223ed6..a443bb2 100644
--- a/Contentstack.Management.Core/Services/Models/PublishUnpublishService.cs
+++ b/Contentstack.Management.Core/Services/Models/PublishUnpublishService.cs
@@ -83,7 +83,7 @@ public override void ContentBody()
                     writer.WriteValue(locale);
 
                 }
-                if (!string.IsNullOrEmpty(details.Version))
+                if (!string.IsNullOrEmpty(details.ScheduledAt))
                 {
                     writer.WritePropertyName("scheduled_at");
                     writer.WriteValue(details.ScheduledAt);