diff --git a/api/schemas.py b/api/schemas.py
index dabeea83d..5cae3a31a 100644
--- a/api/schemas.py
+++ b/api/schemas.py
@@ -363,11 +363,10 @@ class AlertSchema(BaseModel):
 
     @root_validator(pre=True)
     def transform_alert(cls, values):
+        values["seriesId"] = None
         if isinstance(values["query"]["left"], int):
             values["seriesId"] = values["query"]["left"]
             values["query"]["left"] = AlertColumn.custom
-        else:
-            values["seriesId"] = None
 
         return values