diff --git a/api/services/workflow_app_service.py b/api/services/workflow_app_service.py
index 7d313bbc30..24bff5881d 100644
--- a/api/services/workflow_app_service.py
+++ b/api/services/workflow_app_service.py
@@ -86,16 +86,22 @@ class WorkflowAppService:
                 ),
             )
         if created_by_account:
-            account = session.scalar(
-                select(Account).where(Account.email == created_by_account)
-            )
-            account_id = account.id if account else None
+            account = session.scalar(select(Account).where(Account.email == created_by_account))
+            if not account:
+                return {
+                    "page": page,
+                    "limit": limit,
+                    "total": 0,
+                    "has_more": False,
+                    "data": [],
+                }
+
             stmt = stmt.join(
                 Account,
                 and_(
                     WorkflowAppLog.created_by == Account.id,
                     WorkflowAppLog.created_by_role == CreatorUserRole.ACCOUNT,
-                    Account.id == account_id,
+                    Account.id == account.id,
                 ),
             )