diff --git a/src/app/_services/transaction.service.ts b/src/app/_services/transaction.service.ts
index 94164ae..bcd4ca6 100644
--- a/src/app/_services/transaction.service.ts
+++ b/src/app/_services/transaction.service.ts
@@ -108,9 +108,14 @@ export class TransactionService {
   }
 
   addTransaction(transaction, cacheSize: number): void {
+    const savedIndex = this.transactions.findIndex(tx => tx.tx.txHash === transaction.tx.txHash);
+    if (savedIndex === 0) { return; }
+    if (savedIndex > 0) {
+      this.transactions.splice(savedIndex, 1);
+    }
     this.transactions.unshift(transaction);
     if (this.transactions.length > cacheSize) {
-      this.transactions.length = cacheSize;
+      this.transactions.length = Math.min(this.transactions.length, cacheSize);
     }
     this.transactionList.next(this.transactions);
   }