diff --git a/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts b/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
index b4d698bb2..13608bb73 100644
--- a/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
+++ b/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
@@ -412,7 +412,7 @@ export class MempoolBlocksComponent implements OnInit, OnChanges, OnDestroy {
   }
 
   calculateTransactionPosition() {
-    if ((!this.txPosition && !this.txFeePerVSize && (this.markIndex === undefined || this.markIndex === -1)) || !this.mempoolBlocks) {
+    if ((!this.txPosition && !this.txFeePerVSize && (this.markIndex === undefined || this.markIndex === -1)) || !this.mempoolBlocks?.length) {
       this.arrowVisible = false;
       return;
     } else if (this.markIndex > -1) {