diff --git a/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.CallFunctions.cs b/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.CallFunctions.cs
index ce614c2d..6b1ab6ca 100644
--- a/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.CallFunctions.cs
+++ b/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.CallFunctions.cs
@@ -43,6 +43,7 @@ public partial class ConversationService
             catch (Exception ex)
             {
                 msg.Content = ex.Message;
+                msg.StopCompletion = true;
                 _logger.LogError(msg.Content);
             }
             
diff --git a/src/Infrastructure/BotSharp.Core/Instructs/InstructService.CallFunctions.cs b/src/Infrastructure/BotSharp.Core/Instructs/InstructService.CallFunctions.cs
index ae36b518..0e558204 100644
--- a/src/Infrastructure/BotSharp.Core/Instructs/InstructService.CallFunctions.cs
+++ b/src/Infrastructure/BotSharp.Core/Instructs/InstructService.CallFunctions.cs
@@ -37,6 +37,7 @@ public partial class InstructService
             catch (Exception ex)
             {
                 msg.Content = ex.Message;
+                msg.StopCompletion = true;
                 _logger.LogError(msg.Content);
             }