diff --git a/src/Infrastructure/BotSharp.Core.Crontab/Functions/TaskWaitFn.cs b/src/Infrastructure/BotSharp.Core.Crontab/Functions/TaskWaitFn.cs
index b4e63a76..0fb68dc9 100644
--- a/src/Infrastructure/BotSharp.Core.Crontab/Functions/TaskWaitFn.cs
+++ b/src/Infrastructure/BotSharp.Core.Crontab/Functions/TaskWaitFn.cs
@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.Json.Serialization;
 using System.Threading.Tasks;
 
 namespace BotSharp.Core.Crontab.Functions;
@@ -22,12 +23,17 @@ public class TaskWaitFn : IFunctionCallback
         try
         {
             var args = JsonSerializer.Deserialize<TaskWaitArgs>(message.FunctionArgs);
-            if (args != null || args.DelayTime > 0)
+            if (args != null && args.DelayTime > 0)
             {
                 await Task.Delay(args.DelayTime * 1000);
             }
             message.Content = "wait task completed";
         }
+        catch (JsonException jsonEx)
+        {
+            message.Content = "Invalid function arguments format.";
+            _logger.LogError(jsonEx, "Json deserialization failed.");
+        }
         catch (Exception ex)
         {
             message.Content = "Unable to perform delay task";