diff --git a/x-pack/legacy/plugins/siem/server/lib/timeline/routes/schemas/schemas.ts b/x-pack/legacy/plugins/siem/server/lib/timeline/routes/schemas/schemas.ts
index 6552f973a66fa9..fc87a775a9e68f 100644
--- a/x-pack/legacy/plugins/siem/server/lib/timeline/routes/schemas/schemas.ts
+++ b/x-pack/legacy/plugins/siem/server/lib/timeline/routes/schemas/schemas.ts
@@ -139,9 +139,9 @@ export const kqlQuery = Joi.object({
     kuery: Joi.object({
       kind: allowEmptyString,
       expression: allowEmptyString,
-    }),
+    }).allow(null),
     serializedQuery: allowEmptyString,
-  }),
+  }).allow(null),
 });
 export const pinnedEventIds = Joi.array()
   .items(allowEmptyString)