diff --git a/src/apps/Caspian.WorkflowFramework/Services/WorkflowService.cs b/src/apps/Caspian.WorkflowFramework/Services/WorkflowService.cs
index de8e96e..2001258 100644
--- a/src/apps/Caspian.WorkflowFramework/Services/WorkflowService.cs
+++ b/src/apps/Caspian.WorkflowFramework/Services/WorkflowService.cs
@@ -4,6 +4,7 @@ using System.Diagnostics;
 using System.Dynamic;
 using System.Linq;
 using System.Text;
+using System.Text.Json;
 using System.Threading.Tasks;
 using Azure;
 using Caspian.WorkflowFramework.Contracts;
@@ -168,15 +169,21 @@ public class WorkflowService : IWorkflowService, ILoggable
                 return response;
             }
 
-            var json = input.EventData.GetRawText();
+            dynamic payload = null;
 
-            var settings = new JsonSerializerSettings
+            if (input.EventData.ValueKind != JsonValueKind.Undefined &&
+                input.EventData.ValueKind != JsonValueKind.Null)
             {
-                Converters = { new ExpandoObjectConverter() }
-            };
+                var json = input.EventData.GetRawText();
 
-            // تبدیل JSON به object داینامیک
-            dynamic payload = JsonConvert.DeserializeObject<ExpandoObject>(json, settings);
+                var settings = new JsonSerializerSettings
+                {
+                    Converters = { new ExpandoObjectConverter() }
+                };
+
+                // تبدیل JSON به object داینامیک
+                payload = JsonConvert.DeserializeObject<ExpandoObject>(json, settings);
+            }
 
             //await _eventPublisher.PublishAsync(input.EventName, null, input.WorkflowInstanceId, null, input.EventData, asynchronous: true);
             await _eventPublisher.PublishAsync(input.EventName, null, input.WorkflowInstanceId, null, payload);