diff --git a/src/services/adapters/CesiumAdapter.ts b/src/services/adapters/CesiumAdapter.ts
index 2e67109..a2257d7 100644
--- a/src/services/adapters/CesiumAdapter.ts
+++ b/src/services/adapters/CesiumAdapter.ts
@@ -83,8 +83,8 @@ function countryCodeFromCity(city: string): string {
 const HitSchema = z.object({
   _id: z.string(),
   _source: z.object({
-    title:    z.string().optional(),
-    city:     z.string().optional(),
+    title:    z.string().nullable().optional(),
+    city:     z.string().nullable().optional(),
     geoPoint: z.unknown().optional(),
   }),
 });