diff --git a/webserver/server/app/controllers/ProjectedNftRangeController.ts b/webserver/server/app/controllers/ProjectedNftRangeController.ts
index e45c5084..9aca0270 100644
--- a/webserver/server/app/controllers/ProjectedNftRangeController.ts
+++ b/webserver/server/app/controllers/ProjectedNftRangeController.ts
@@ -37,7 +37,7 @@ export class ProjectedNftRangeController extends Controller {
             );
         }
 
-        if (requestBody.address !== null) {
+        if (requestBody.address !== undefined) {
             return await this.handle_by_address_query(requestBody.address, requestBody);
         } else {
             return await this.handle_general_query(requestBody);
diff --git a/webserver/shared/models/ProjectedNftRange.ts b/webserver/shared/models/ProjectedNftRange.ts
index 302d8a6f..efc87ac5 100644
--- a/webserver/shared/models/ProjectedNftRange.ts
+++ b/webserver/shared/models/ProjectedNftRange.ts
@@ -16,7 +16,7 @@ export type ProjectedNftRangeRequest = {
          */
         maxSlot: number
     },
-    address: string | null
+    address: string | undefined
 };
 
 export type ProjectedNftRangeResponse = {