diff --git a/frontend/src/app/components/transaction/transaction.component.ts b/frontend/src/app/components/transaction/transaction.component.ts
index 0faa328c0..e856f34eb 100644
--- a/frontend/src/app/components/transaction/transaction.component.ts
+++ b/frontend/src/app/components/transaction/transaction.component.ts
@@ -379,7 +379,7 @@ export class TransactionComponent implements OnInit, AfterViewInit, OnDestroy {
                 ancestors: tx.ancestors,
                 bestDescendant: tx.bestDescendant,
               };
-              const hasRelatives = !!(tx.ancestors.length || tx.bestDescendant);
+              const hasRelatives = !!(tx.ancestors?.length || tx.bestDescendant);
               this.hasEffectiveFeeRate = hasRelatives || (tx.effectiveFeePerVsize && (Math.abs(tx.effectiveFeePerVsize - tx.feePerVsize) > 0.01));
             } else {
               this.fetchCpfp$.next(this.tx.txid);