diff --git a/api/schemas.py b/api/schemas.py
index 65db116c0..158850618 100644
--- a/api/schemas.py
+++ b/api/schemas.py
@@ -818,7 +818,7 @@ class CustomMetricChartPayloadSchema(CustomMetricSessionsPayloadSchema):
         alias_generator = attribute_to_camel_case
 
 
-class CreateCustomMetricsSchema(CustomMetricChartPayloadSchema):
+class TryCustomMetricsPayloadSchema(CustomMetricChartPayloadSchema):
     name: str = Field(...)
     series: List[CustomMetricCreateSeriesSchema] = Field(...)
     is_public: bool = Field(default=True)
@@ -859,6 +859,10 @@ class CreateCustomMetricsSchema(CustomMetricChartPayloadSchema):
         alias_generator = attribute_to_camel_case
 
 
+class CreateCustomMetricsSchema(TryCustomMetricsPayloadSchema):
+    series: List[CustomMetricCreateSeriesSchema] = Field(..., min_items=1)
+
+
 class CustomMetricUpdateSeriesSchema(CustomMetricCreateSeriesSchema):
     series_id: Optional[int] = Field(None)