diff --git a/agent/canvas.py b/agent/canvas.py
index 72ab3c103..41410e64e 100644
--- a/agent/canvas.py
+++ b/agent/canvas.py
@@ -224,17 +224,16 @@ class Canvas(ABC):
                     for m in prepare2run([switch_out]):
                         yield {"content": m, "running_status": True}
                 except Exception as e:
-                    yield {"content": "*Exception*: {}".format(e), "running_status": True}
                     logging.exception("Canvas.run got exception")
+                    raise e
                 continue
 
             try:
                 for m in prepare2run(cpn["downstream"]):
                     yield {"content": m, "running_status": True}
             except Exception as e:
-                yield {"content": "*Exception*: {}".format(e), "running_status": True}
                 logging.exception("Canvas.run got exception")
-                ran += 1
+                raise e
 
             if ran >= len(self.path[-1]) and waiting:
                 without_dependent_checking = waiting
diff --git a/api/db/services/llm_service.py b/api/db/services/llm_service.py
index 128f154f2..16fd42ca1 100644
--- a/api/db/services/llm_service.py
+++ b/api/db/services/llm_service.py
@@ -196,8 +196,7 @@ class TenantLLMService(CommonService):
             else:
                 tenant_llms = cls.query(tenant_id=tenant_id, llm_name=llm_name)
             if not tenant_llms:
-                if not llm_factory: llm_factory = mdlnm
-                num = cls.model.create(tenant_id=tenant_id, llm_factory=llm_factory, llm_name=llm_name, used_tokens=used_tokens)
+                return num
             else:
                 tenant_llm = tenant_llms[0]
                 num = cls.model.update(used_tokens=tenant_llm.used_tokens + used_tokens)\