diff --git a/libs/client/src/types.ts b/libs/client/src/types.ts
index 285f9d8..3067714 100644
--- a/libs/client/src/types.ts
+++ b/libs/client/src/types.ts
@@ -14,7 +14,7 @@ export type RequestLog = {
 };
 
 export type Metrics = {
-  inference_time: number;
+  inference_time: number | null;
 };
 
 export type QueueStatus =