diff --git a/x-pack/legacy/plugins/ml/server/new_platform/results_service_schema.ts b/x-pack/legacy/plugins/ml/server/new_platform/results_service_schema.ts
index fd8ecba0b20dfb..32d829db7f81b7 100644
--- a/x-pack/legacy/plugins/ml/server/new_platform/results_service_schema.ts
+++ b/x-pack/legacy/plugins/ml/server/new_platform/results_service_schema.ts
@@ -35,8 +35,8 @@ export const categoryDefinitionSchema = {
 
 export const maxAnomalyScoreSchema = {
   jobIds: schema.arrayOf(schema.string()),
-  earliestMs: schema.number(),
-  latestMs: schema.number(),
+  earliestMs: schema.maybe(schema.number()),
+  latestMs: schema.maybe(schema.number()),
 };
 
 export const categoryExamplesSchema = {