diff --git a/frontend/src/app/components/blocks-list/blocks-list.component.ts b/frontend/src/app/components/blocks-list/blocks-list.component.ts
index 725b6dc74..1af6572fc 100644
--- a/frontend/src/app/components/blocks-list/blocks-list.component.ts
+++ b/frontend/src/app/components/blocks-list/blocks-list.component.ts
@@ -84,7 +84,7 @@ export class BlocksList implements OnInit {
         .pipe(
           switchMap((blocks) => {
             if (blocks[0].height <= this.lastBlockHeight) {
-              return null; // Return an empty stream so the last pipe is not executed
+              return of([]); // Return an empty stream so the last pipe is not executed
             }
             this.lastBlockHeight = blocks[0].height;
             return of(blocks);