diff --git a/api/chalicelib/utils/helper.py b/api/chalicelib/utils/helper.py
index 85e34ec80..369aff40a 100644
--- a/api/chalicelib/utils/helper.py
+++ b/api/chalicelib/utils/helper.py
@@ -283,6 +283,7 @@ def custom_alert_to_front(values):
     # to support frontend format for payload
     if values.get("seriesId") is not None and values["query"]["left"] == schemas.AlertColumn.custom:
         values["query"]["left"] = values["seriesId"]
+        values["seriesId"] = None
     return values
 
 
diff --git a/api/schemas.py b/api/schemas.py
index ab057426a..dabeea83d 100644
--- a/api/schemas.py
+++ b/api/schemas.py
@@ -363,9 +363,11 @@ class AlertSchema(BaseModel):
 
     @root_validator(pre=True)
     def transform_alert(cls, values):
-        if values.get("seriesId") is None and isinstance(values["query"]["left"], int):
+        if isinstance(values["query"]["left"], int):
             values["seriesId"] = values["query"]["left"]
             values["query"]["left"] = AlertColumn.custom
+        else:
+            values["seriesId"] = None
 
         return values