diff --git a/api/apps/api_app.py b/api/apps/api_app.py
index eb9bd6c520e..c291a4ab173 100644
--- a/api/apps/api_app.py
+++ b/api/apps/api_app.py
@@ -87,7 +87,8 @@ def token_list():
         if not tenants:
             return get_data_error_result(retmsg="Tenant not found!")
 
-        objs = APITokenService.query(tenant_id=tenants[0].tenant_id, dialog_id=request.args["dialog_id"])
+        id = request.args.get("dialog_id", request.args["canvas_id"])
+        objs = APITokenService.query(tenant_id=tenants[0].tenant_id, dialog_id=id)
         return get_json_result(data=[o.to_dict() for o in objs])
     except Exception as e:
         return server_error_response(e)
@@ -123,7 +124,8 @@ def stats():
                      days=7)).strftime("%Y-%m-%d 24:00:00")),
             request.args.get(
                 "to_date",
-                datetime.now().strftime("%Y-%m-%d %H:%M:%S")))
+                datetime.now().strftime("%Y-%m-%d %H:%M:%S")),
+            "agent" if request.args.get("canvas_id") else None)
         res = {
             "pv": [(o["dt"], o["pv"]) for o in objs],
             "uv": [(o["dt"], o["uv"]) for o in objs],
diff --git a/api/db/services/api_service.py b/api/db/services/api_service.py
index 6b2eccf3721..a99f45aea24 100644
--- a/api/db/services/api_service.py
+++ b/api/db/services/api_service.py
@@ -45,7 +45,7 @@ def append_message(cls, id, conversation):
 
     @classmethod
     @DB.connection_context()
-    def stats(cls, tenant_id, from_date, to_date):
+    def stats(cls, tenant_id, from_date, to_date, source=None):
         return cls.model.select(
             cls.model.create_date.truncate("day").alias("dt"),
             peewee.fn.COUNT(
@@ -62,5 +62,6 @@ def stats(cls, tenant_id, from_date, to_date):
                 cls.model.thumb_up).alias("thumb_up")
         ).join(Dialog, on=(cls.model.dialog_id == Dialog.id & Dialog.tenant_id == tenant_id)).where(
             cls.model.create_date >= from_date,
-            cls.model.create_date <= to_date
+            cls.model.create_date <= to_date,
+            cls.model.source == source
         ).group_by(cls.model.create_date.truncate("day")).dicts()
diff --git a/rag/utils/__init__.py b/rag/utils/__init__.py
index e6b7552bcd7..63bb582a706 100644
--- a/rag/utils/__init__.py
+++ b/rag/utils/__init__.py
@@ -74,10 +74,15 @@ def findMaxTm(fnm):
 
 encoder = tiktoken.encoding_for_model("gpt-3.5-turbo")
 
+
 def num_tokens_from_string(string: str) -> int:
     """Returns the number of tokens in a text string."""
-    num_tokens = len(encoder.encode(string))
-    return num_tokens
+    try:
+        num_tokens = len(encoder.encode(string))
+        return num_tokens
+    except Exception as e:
+        pass
+    return 0
 
 
 def truncate(string: str, max_len: int) -> int: